diff --git a/general/releases/4.5/4.5.9.md b/general/releases/4.5/4.5.9.md
index d56394e56..a480c316a 100644
--- a/general/releases/4.5/4.5.9.md
+++ b/general/releases/4.5/4.5.9.md
@@ -12,6 +12,10 @@ import { ReleaseNoteIntro } from '@site/src/components/ReleaseInformation';
 
 <ReleaseNoteIntro releaseName={frontMatter.moodleVersion} />
 
+:::warning Important 4.5.9 upgrade notice
+Please note that sites using third party themes that modify the core admin renderer (such as <!-- cspell:disable -->Moove<!-- cspell:enable -->) are recommended **not** to upgrade to this minor version, as there is a known breaking change which affects access to site administration. Sites using Boost, Classic or other themes which do not modify site administration rendering are not affected, and it is safe to upgrade (for more information, see MDL-87892). An unscheduled release which addresses this bug will be released imminently.
+:::
+
 ## General fixes and improvements
 <!-- cspell:disable -->
 - [MDL-87356](https://moodle.atlassian.net/browse/MDL-87356) - Orphaned random questions should be deleted
diff --git a/general/releases/5.0/5.0.5.md b/general/releases/5.0/5.0.5.md
index 8136114f6..cf6cbf7ac 100644
--- a/general/releases/5.0/5.0.5.md
+++ b/general/releases/5.0/5.0.5.md
@@ -12,6 +12,10 @@ import { ReleaseNoteIntro } from '@site/src/components/ReleaseInformation';
 
 <ReleaseNoteIntro releaseName={frontMatter.moodleVersion} />
 
+:::warning Important 5.0.5 upgrade notice
+Please note that sites using third party themes that modify the core admin renderer (such as <!-- cspell:disable -->Moove<!-- cspell:enable -->) are recommended **not** to upgrade to this minor version, as there is a known breaking change which affects access to site administration. Sites using Boost, Classic or other themes which do not modify site administration rendering are not affected, and it is safe to upgrade (for more information, see MDL-87892). An unscheduled release which addresses this bug will be released imminently.
+:::
+
 ## General fixes and improvements
 <!-- cspell:disable -->
 - [MDL-51447](https://moodle.atlassian.net/browse/MDL-51447) - Hidden activities are listed on the completion progress details page
diff --git a/general/releases/5.1/5.1.2.md b/general/releases/5.1/5.1.2.md
index 4c529183a..0caada702 100644
--- a/general/releases/5.1/5.1.2.md
+++ b/general/releases/5.1/5.1.2.md
@@ -12,6 +12,10 @@ import { ReleaseNoteIntro } from '@site/src/components/ReleaseInformation';
 
 <ReleaseNoteIntro releaseName={frontMatter.moodleVersion} />
 
+:::warning Important 5.1.2 upgrade notice
+Please note that sites using third-party themes that modify the core admin renderer (such as <!-- cspell:disable -->Moove<!-- cspell:enable -->) are recommended **not** to upgrade to this minor version, as there is a known breaking change which affects access to site administration. Sites using Boost, Classic or other themes which do not modify site administration rendering are not affected, and it is safe to upgrade (for more information, see MDL-87892). An unscheduled release which addresses this bug will be released imminently.
+:::
+
 ## General fixes and improvements
 <!-- cspell:disable -->
 - [MDL-51447](https://moodle.atlassian.net/browse/MDL-51447) - Hidden activities are listed on the completion progress details page