diff --git a/content/_data/changelogs/lts.yml b/content/_data/changelogs/lts.yml
index 2d8bd0a33501..a3bef5fa9062 100644
--- a/content/_data/changelogs/lts.yml
+++ b/content/_data/changelogs/lts.yml
@@ -9733,6 +9733,494 @@
     message: |-
       Restore context menus of model links in build history views and administrative monitors (regression in 2.402).
 
+- version: "2.426.1"
+  date: 2023-11-15
+  banner: >
+      Short container image tags (without "jdk" in them) such as <code>jenkins/jenkins:2.426.1</code> are now using Java 17.
+      If you need to continue using Java 11, use tags like <code>jenkins/jenkins:2.426.1-jdk11</code>.
+  lts_predecessor: "2.414.3"
+  lts_baseline: "2.426"
+  changes: # compared to lts_baseline 2.426 - extracted from the RC commit(s)
+
+  - type: major bug
+    category: bug
+    pull: 8422
+    authors:
+      - daniel-beck
+    pr_title: "[JENKINS-71252][JENKINS-70793] Multiple form validation fixes"
+    references:
+      - issue: 71252
+      - issue: 70793
+    message: |-
+      Show form validation results for form elements that are initially hidden.
+      Remove previous form validation errors when the form validation is updated with new content (regression in 2.355).
+  - type: major bug
+    category: bug
+    issue: 72170
+    pull: 8602
+    authors:
+      - mawinter69
+    pr_title: "[JENKINS-72170] fix nested hetero-list entries with mixture of inputs and buttons"
+    message: |-
+      Fix multibranch Pipeline <strong>Add source</strong> and other uses that mix inputs and buttons (regression in 2.422).
+  - type: major bug
+    category: bug
+    issue: 72163
+    authors:
+      - basil
+    pr_title: "[JENKINS-72163] Retry on initial connection failure occurs in one entrypoint but not the other"
+    references:
+      - url: https://github.com/jenkinsci/remoting/pull/675
+        title: Remoting PR 675
+    message: |-
+      Add <code>sleep</code> call when <code>-noReconnect</code> is not specified for Kubernetes agents.
+  - type: major bug
+    category: bug
+    issue: 65368
+    authors:
+      - sunweisheng
+    pr_title: "Remoting agent.jar does not work behind proxy"
+    message: |-
+      Add proxy support for Remoting.
+  - type: major bug
+    category: regression
+    pull: 8564
+    issue: 71937
+    authors:
+      - Vlatombe
+    pr_title: "[JENKINS-71937] Fix deprecated 'Slave' constructor"
+    message: |-
+      Fix agent allocation due to label issue detected by vSphere Cloud plugin (regression in 2.421).
+  - type: major bug
+    category: regression
+    pull: 8613
+    issue: 72189
+    authors:
+      - mawinter69
+    pr_title: "[JENKINS-72189] fix drag&drop handle for existing repeatables"
+    message: |-
+      Fix drag and drop handle for existing repeatables (regression in 2.335).
+  - type: rfe
+    category: rfe
+    pull: 8564
+    issue: 72248
+    authors:
+      - daniel-beck
+    pr_title: "Add telemetry for Jenkins uptime"
+    message: |-
+      Add telemetry for Jenkins uptime.
+  - type: rfe
+    category: rfe
+    pull: 8587
+    issue: 72156
+    authors:
+    - olamy
+    pr_title: "[JENKINS-72156] Backport Upgrade to Winstone 6.14 which contains an upgrade to Jetty 10.0.17"
+    references:
+      - url: https://github.com/jenkinsci/winstone/releases/tag/winstone-6.13
+        title: Winstone 6.13 changelog
+      - url: https://github.com/jenkinsci/winstone/releases/tag/winstone-6.14
+        title: Winstone 6.14 changelog
+      - url: https://github.com/eclipse/jetty.project/releases/tag/jetty-10.0.16
+        title: Jetty 10.0.16 changelog
+      - url: https://github.com/eclipse/jetty.project/releases/tag/jetty-10.0.17
+        title: Jetty 10.0.17 changelog
+      - url: https://nvd.nist.gov/vuln/detail/CVE-2023-44487
+        title: CVE-2023-44487
+    message: |-
+      Upgrade Winstone from 6.12 to 6.14.
+      This includes the upgrade of Jetty from 10.0.15 to 10.0.17.
+      The Jetty upgrade includes fixes for several CVEs.
+  - type: bug
+    category: regression
+    pull: 8606
+    issue: 72179
+    authors:
+      - daniel-beck
+    pr_title: "[JENKINS-72179] Show description of boolean build parameter values"
+    message: |-
+      Show the description of boolean build parameter values on the Parameters view (regression in 2.179).
+  - type: bug
+    category: regression
+    pull: 8492
+    issue: 72020
+    authors:
+      - Vlatombe
+    pr_title: "[JENKINS-72020] Restore ability to reorder clouds"
+    message: |-
+      Allow clouds to be reordered.
+      This was previously possible, but disappeared when the cloud management was moved to a separate page (regression in 2.403).
+  - type: bug
+    category: regression
+    pull: 8674
+    issue: 70994
+    authors:
+      - basil
+    pr_title: "[JENKINS-70994] Upgrade bundled SnakeYAML plugin from 1.33-95.va_b_a_e3e47b_fa_4 to 2.2-111.vc6598e30cc65"
+    message: |-
+      Update SnakeYAML plugin to 2.2 to silence security scanners.
+
+  lts_changes: # compared to lts_predecessor 2.414.3 (selected by personal review)
+
+  - type: security
+    authors:
+      - Kevin-CB
+      - dwnusbaum
+    message: |-
+      Important security fixes.
+    references:
+      - url: /security/advisory/2023-09-20/
+        title: 2023-09-20 security advisory
+      - url: /security/advisory/2023-07-26/
+        title: 2023-07-26 security advisory
+  - type: major rfe
+    category: major rfe
+    pull: 7781
+    authors:
+      - timja
+      - basil
+    pr_title: "[JENKINS-70906] Remove prototype from core"
+    references:
+      - issue: 70906
+      - pull: 7781
+      - url: https://www.jenkins.io/blog/2023/05/12/removing-prototype-from-jenkins/
+        title: Prototype removal blog post
+    message: |-
+      Remove outdated Prototype.js library.
+  - type: major rfe
+    category: major rfe
+    authors:
+      - MarkEWaite
+    pr_title: "Remove CentOS 7 container images"
+    references:
+      - url: "/blog/2023/05/30/operating-system-end-of-life/"
+        title: Red Hat Enterprise Linux 7 and CentOS 7 end of life blog post
+      - url: https://github.com/jenkinsci/docker/pull/1777
+        title: Docker pull request 1777
+    message: |-
+      Stop delivering CentOS 7 container images as part of the end of support for Red Hat Enterprise Linux 7 and its derivatives.
+  - type: major rfe
+    category: rfe
+    pull: 7938
+    issue: 71438
+    authors:
+      - mawinter69
+    pr_title: "[JENKINS-71438] Replace browser confirm with modal dialogs"
+    message: |-
+      Replace browser confirm with modal dialogs in many places.
+      Add API for alert, confirm, prompt, modal and form dialogs.
+  - type: major rfe
+    category: rfe
+    pull: 8418
+    authors:
+    - mawinter69
+    - janfaracik
+    - NotMyFault
+    pr_title: "Replace hetero-list YUI button and menu with new style button and tippy.js menu"
+    references:
+      - pull: 8381
+      - pull: 8376
+      - pull: 8375
+      - pull: 8363
+      - pull: 8180
+    message: |-
+      Updates to various UI elements.
+      Modernize buttons, menus, link design, and content blocks.
+  - type: major rfe
+    category: rfe
+    pull: 8403
+    authors:
+      - timja
+    pr_title: "Add Appearance system configuration page"
+    message: |-
+      Add <strong>Appearance</strong> system configuration page to customize Jenkins' look and feel.
+  - type: major rfe
+    category: rfe
+    pull: 8528
+    authors:
+    - jglick
+    - Vlatombe
+    pr_title: "Avoid saving disabled status when deleting a project"
+    references:
+      - pull: 8494
+      - pull: 8395
+      - pull: 8299
+    message: |-
+      Various performance optimizations.
+      Optimizations for loading, label parsing, and project deletion.
+  - type: major bug
+    category: bug
+    pull: 8448
+    authors:
+      - Vlatombe
+    pr_title: "Label parsing robustness fix"
+    message: |-
+      Prevent incorrect <code>readResolve</code> implementations from breaking agent label parsing.
+  - type: rfe
+    category: rfe
+    pull: 8526
+    authors:
+      - basil
+    pr_title: "Automate Java version recommendation administrative monitor"
+    message: |-
+      Automate the display of an administrative monitor when approaching Java end of life (EOL) dates.
+  - type: rfe
+    category: rfe
+    authors:
+      - philfry
+    pr_title: "RPM: Remove System V initialization script"
+    references:
+      - url: https://github.com/jenkinsci/packaging/pull/409
+        title: pull 409 (packaging)
+      - url: https://www.jenkins.io/blog/2022/03/25/systemd-migration/
+        title: Linux install packages migrated from System V init to systemd
+    message: |-
+      Remove System V initialization scripts from RPM based installers.
+      The System V initialization scripts were replaced in March 2022 with systemd initialization.
+      RPM users with a custom log directory no longer have a <code>logrotate(8)</code> configuration out-of-the-box.
+  - type: rfe
+    category: rfe
+    pull: 8250
+    issue: 71087
+    authors:
+      - daniel-beck
+    pr_title: "[JENKINS-71087] Nicer 404 error pages"
+    message: |-
+      Add a nicer 404 error page.
+  - type: rfe
+    category: rfe
+    pull: 8503
+    authors:
+      - basil
+    pr_title: "Increase minimum required Remoting version from 4.7 to 4.13"
+    message: |-
+      The minimum required Remoting version has been increased from 4.7 to 4.13.
+  - type: rfe
+    category: rfe
+    pull: 8453
+    issue: 71950
+    authors:
+      - basil
+    pr_title: "[JENKINS-71950] List plugins in deterministic order"
+    message: |-
+      List plugins in deterministic order to improve diagnosability of plugin linkage errors.
+  - type: rfe
+    category: rfe
+    pull: 8208
+    authors:
+      - janfaracik
+    pr_title: "Display a notice when there are plugins installed or updates available"
+    message: |-
+      Display a notice when plugin updates are available or when there are no plugins installed.
+  - type: rfe
+    category: rfe
+    pull: 8265
+    issue: 71054
+    authors:
+      - yaroslavafenkin
+    pr_title: "[JENKINS-71054] Remove the treeview option for artifactList"
+    message: |-
+      Remove the treeview option for artifactList.
+  - type: rfe
+    category: rfe
+    pull: 8283
+    authors:
+      - meiswjn
+    pr_title: "Add logging for agent usage by job"
+    message: |-
+      Log agent usage by job.
+  - type: rfe
+    category: rfe
+    pull: 8262
+    issue: 71496
+    authors:
+      - mawinter69
+    pr_title: "[JENKINS-71496] Make tab pane selection reachable via keyboard"
+    message: |-
+      Make tab panes accessible via keyboard.
+  - type: rfe
+    category: rfe
+    pull: 8273
+    issue: 71366
+    authors:
+      - mattpulver
+    pr_title: "[JENKINS-71366] Set sandbox allow-same-origin in DEFAULT_CSP_VALUE."
+    message: |-
+      Add <code>allow-same-origin</code> to the <code>sandbox</code> ContentSecurityPolicy directive of workspace and artifact browsers if the Resource Root URL feature is not used.
+      Allow requests to resources like stylesheets and images, even if a reverse proxy prohibits cross-site requests.
+  - type: rfe
+    category: rfe
+    pull: 8129
+    authors:
+      - janfaracik
+    pr_title: Add last build status to job page
+    message: |-
+      Add last build status to job page.
+  - type: rfe
+    category: rfe
+    pull: 8446
+    authors:
+    - mustafau
+    pr_title: "Turkish localization fixes for the new job page"
+    references:
+      - pull: 8368
+    message: |-
+      Updates to Turkish localization for jobs.
+  - type: rfe
+    category: rfe
+    pull: 8258
+    authors:
+      - daniel-beck
+    pr_title: Remove Rebuilder Plugin from setup wizard options
+    message: |-
+      Remove the rebuild plugin from the setup wizard plugin selection.
+  - type: rfe
+    category: rfe
+    pull: 8503
+    authors:
+      - basil
+    pr_title: "Remove KXML2 library"
+    message: |-
+      Stop shipping <code>net.sf.kxml:kxml2</code> because Jenkins no longer depends on it.
+  - type: bug
+    category: bug
+    pull: 8425
+    issue: 71479
+    authors:
+      - dwnusbaum
+    pr_title: "[JENKINS-71479] Do not use SCSS lighten function directly to avoid\
+      \ invalid CSS"
+    message: |-
+      Fix invalid CSS which caused some buttons to become invisible on hover.
+  - type: bug
+    category: bug
+    pull: 8529
+    issue: 72067
+    authors:
+      - basil
+    pr_title: "[JENKINS-72067] High memory usage from `XStream2.AssociatedConverterImpl`"
+    message: |-
+      Reduce high memory usage from <code>XStream2.AssociatedConverterImpl</code>.
+  - type: bug
+    category: bug
+    pull: 8474
+    authors:
+      - jtnord
+    pr_title: fix signup autofocus
+    message: |-
+      Prevent log spam when using the Jenkins security database and users signup.
+  - type: bug
+    category: bug
+    pull: 8493
+    issue: 71880
+    authors:
+      - mawinter69
+    pr_title: "[JENKINS-71880] fix notification in breadcrumb"
+    message: |-
+      Show a confirmation popup when triggering a task action from a context menu.
+  - type: bug
+    category: bug
+    pull: 8485
+    issue: 72018
+    authors:
+      - flabrie
+    pr_title: "[JENKINS-72018] Form entries in .repeated-chunk using .show-if-not-only\
+      \ CSS class are not hidden when they are alone"
+    message: |-
+      Hide the delete button from the only repeatable element in configuration forms when at least one element is expected.
+  - type: bug
+    category: bug
+    pull: 8490
+    issue: 72016
+    authors:
+      - jglick
+    pr_title: "[JENKINS-72016] Define a thread pool for `ProxyConfiguration`'s\
+      \ `HttpClient`"
+    message: |-
+      Do not create a large number of threads when making numerous HTTP requests.
+  - type: bug
+    category: bug
+    pull: 8471
+    issue: 71983
+    authors:
+      - mawinter69
+    pr_title: "[JENKINS-71983] allow symbols in MenuItem#withIconClass"
+    message: |-
+      Symbols display in breadcrumbs now.
+  - type: bug
+    category: bug
+    pull: 8416
+    issue: 38520
+    authors:
+      - dependabot[bot]
+    pr_title: "[JENKINS-38520] Every message in agent log appears twice with the\
+      \ `-agentLog` option"
+    message: |-
+      Message no longer appears twice when the <code>agentLog</code> option is used.
+  - type: bug
+    category: bug
+    pull: 8388
+    issue: 71848
+    authors:
+      - daniel-beck
+    pr_title: "[JENKINS-71848] Remove admin monitors popup from `/manage/` again"
+    message: |-
+      Hide administrative monitors icons/popup in the header of <strong>Manage Jenkins</strong>, as they're shown directly on the page.
+  - type: bug
+    category: bug
+    pull: 8378
+    issue: 61452
+    authors:
+      - jglick
+    pr_title: "[JENKINS-61452] Tolerate corrupt Base64 in `PlainTextConsoleOutputStream`"
+    message: |-
+      The plain text console log will still be printed even if some console annotations are corrupt.
+  - type: bug
+    category: bug
+    pull: 8387
+    issue: 71833
+    authors:
+      - daniel-beck
+    pr_title: "[JENKINS-71833] Fix link to job in slow trigger admin monitor"
+    message: |-
+      Fix link to job in the message informing administrators of trigger computations that run for an unusually long time.
+  - type: bug
+    category: bug
+    pull: 8089
+    authors:
+      - dten
+    pr_title: Use standard size node icon even with long node names
+    message: |-
+      Use standard size node icon even with long node names.
+  - type: bug
+    category: bug
+    pull: 8288
+    issue: 71186
+    authors:
+      - programbeginnerTW
+    pr_title: "[JENKINS-71186] - Avoid a warning from web application scanners"
+    message: |-
+      Add the <code>X-Content-Type-Options</code> HTTP header to the response from the agent listener.
+      Silence security scanners that incorrectly report an issue when the HTTP header is missing.
+  - type: bug
+    category: bug
+    pull: 8293
+    issue: 71698
+    authors:
+      - timja
+    pr_title: "[JENKINS-71698] Only disable plugin manager button if none are\
+      \ selected"
+    message: |-
+      Only disable the plugin manager "install" button if no plugins are selected.
+  - type: bug
+    category: bug
+    pull: 8233
+    authors:
+      - jglick
+    pr_title: "`LazyBuildMixIn.getEstimatedDurationCandidates` duplication"
+    message: |-
+      Estimate project duration accurately in more cases.
+
 # DO NOT EDIT THIS FILE DIRECTLY
 # ALL CHANGES MUST GO THROUGH PULL REQUESTS
 # MALFORMED FILE CONTENTS WILL BREAK THE SITE BUILD
diff --git a/content/_data/upgrades/2-426-1.adoc b/content/_data/upgrades/2-426-1.adoc
new file mode 100644
index 000000000000..72e80e5e0093
--- /dev/null
+++ b/content/_data/upgrades/2-426-1.adoc
@@ -0,0 +1,47 @@
+==== Prototype removed from Jenkins
+
+As of Jenkins 2.426.1, Prototype has been removed from Jenkins core.
+This was initially removed in the weekly 2.426 release and is the result of work done since May 2023.
+Plugins that had previously used Prototype must have its usage removed accordingly.
+Thanks to all of the work from plugin maintainers and contributors, there has been great progress made to ensure that plugins have been updated.
+The list of plugins can be found in our link:https://docs.google.com/spreadsheets/d/1dpaKALZaK0_HIGy6ony3wnegr1frTg3u1lngG4KdoC8/edit#gid=0[tracking sheet].
+At this time, there are four plugins with over 800 installs that have not removed Prototype from their configuration.
+These plugins are:
+
+* link:https://github.com/jenkinsci/xray-connector-plugin/issues/75[Xray Connector]
+* link:https://issues.jenkins.io/browse/JENKINS-71308[Synopsys Coverity]
+* link:https://issues.jenkins.io/browse/JENKINS-71309[qTest]
+* link:https://issues.jenkins.io/browse/JENKINS-71311[Azure App Service]
+
+There are eight other plugins, all under 700 installs, that have issues created for them in the Jenkins issue tracker, linked to the overall link:https://issues.jenkins.io/browse/JENKINS-71309?jql=project%20%3D%20JENKINS%20AND%20resolution%20%3D%20Unresolved%20AND%20%22Epic%20Link%22%20%3D%20JENKINS-70906%20ORDER%20BY%20priority%20DESC%2C%20updated%20DESC[Prototype removal epic].
+
+==== Minimum required Remoting version updated to 4.13
+
+The minimum required Remoting version has been increased to 4.13, which was released on March 4, 2022.
+When an agent with a Remoting version older than 4.13 connects to the Jenkins controller, the agent connection is rejected.
+Ensure that all agents are running a recent version of Remoting prior to upgrading.
+Agents with unsupported Remoting versions can be allowed to connect to the controller by setting the `hudson.slaves.SlaveComputer.allowUnsupportedRemotingVersions` system property to true.
+
+==== Treeview option removed for artifactList
+
+In an effort to ensure content security policy (CSP) compatibility, `hudson.model.Run#TREE_CUTOFF` has been removed in favor of `hudson.model.Run#LIST_CUTOFF`.
+The treeview option was using inline JavaScript, going against the link:https://www.jenkins.io/doc/developer/security/csp/#inline-javascript-blocks[Jenkins CSP standards].
+This is also part of the larger project to link:https://issues.jenkins.io/browse/JENKINS-71014[remove or update any non-compliant code in Jenkins core].
+
+==== Remove System V initialization script
+
+Since March 2022, Jenkins has required the use of `systemd` to manage services.
+For newer systems such as RHEL 7 or Fedora 15 (and above), `systemd` is used and there are no issues.
+However, earlier versions are still using the System V initialization script.
+To remedy this, the System V init script has been removed and RPM users with a custom log directory will no longer have a `logrotate(8)` configuration out-of-the-box.
+
+==== End of support for Red Hat Enterprise Linux 7 and is derivatives
+
+The May 30, 2023 link:/blog/2023/05/30/operating-system-end-of-life/[end of life operating systems blog post] announced the end of support for Red Hat Enterprise Linux 7 and its derivatives like CentOS 7, Scientific Linux 7, and Oracle Linux 7.
+Users should replace their Red Hat Enterprise Linux 7 installations with another operating system.
+If they prefer to continue with Red Hat or one of its derivatives, they have many alternatives, including:
+
+* link:https://access.redhat.com/products/discover-red-hat-enterprise-linux/[Red Hat Enterprise Linux] 8 or 9
+* link:https://almalinux.org/[AlmaLinux] 8 or 9
+* link:https://rockylinux.org/[Rocky Linux] 8 or 9
+* link:https://www.oracle.com/linux/[Oracle Linux] 8 or 9