Here is a list of what was fixed since 11.5.38:

• 2024-08-13 ffdee6433e4 [RELEASE] Release of TYPO3 11.5.39 (thanks to Oliver Hader)
• 2024-08-10 584f83db830 [TASK] Sanitize idn_to_ascii with empty string (thanks to Christian Kuhn)
• 2024-08-10 e47954e4c37 [TASK] Stabilize FileClipboardCest ac test (thanks to Christian Kuhn)
• 2024-08-09 854f56ca6d3 [TASK] Stabilize InlinePagesLocalizeResourceCest ac test (thanks to Christian Kuhn)
• 2024-08-07 42d71b4499c [BUGFIX] Prevent PHP array access errors on invalid shortcut entries (thanks to Garvin Hicking)
• 2024-08-06 5ad8a56dbab [TASK] Raise composer/composer:^2.2.24 (thanks to Oliver Hader)
• 2024-08-06 6fb6d3458bf [TASK] Avoid type error in FileCollector (thanks to Christian Kuhn)
• 2024-08-06 4305a283e8d [BUGFIX] Mitigate change detection loop for enum and set fields (thanks to Stefan Bürk)
• 2024-08-03 97996aa0e2e [BUGFIX] Correctly infer site for new page (thanks to Mathias Bolt Lesniak)
• 2024-07-31 bb6bfdf69fa [BUGFIX] Prevent error in idn_to_ascii (thanks to Markus Sommer)
• 2024-07-29 134f2583888 [BUGFIX] Provide null coalesce operator for array_pop (thanks to Thomas Hohn)
• 2024-07-26 5ff32cf0f0c [TASK] Raise guzzle (thanks to Christian Kuhn)
• 2024-07-26 5a3435caa7d [TASK] Raise typo3/html-sanitizer:^2.2.0 (thanks to Christian Kuhn)
• 2024-07-25 cc220ac92b1 [TASK] Update core-testing-php84 image version in runTests.sh (thanks to Stefan Bürk)
• 2024-07-25 6a1e5905f24 [TASK] Reduce phpstan memory usage (thanks to Christian Kuhn)
• 2024-07-25 ad17707a98a [TASK] runTests.sh: Show phpstan memory consumption (thanks to Christian Kuhn)
• 2024-07-24 170f8d684d2 [TASK] Update requirejs to 2.3.7 (thanks to Andreas Kienast)
• 2024-07-19 53d2160cb26 [TASK] Do not register runTests.sh trap in CI (thanks to Stefan Bürk)
• 2024-07-19 35b38a5f5f1 [TASK] Increase SUFFIX uniqueness in runTests.sh for CI (thanks to Stefan Bürk)
• 2024-07-19 d7b6016218e [BUGFIX] Avoid undefined array key warning in BackendUserAuthentication (thanks to Oliver Hader)
• 2024-07-15 ec9d3058be4 [TASK] Disable unneeded livereload server in grunt-watch (thanks to Benjamin Franzke)
• 2024-07-12 37e21273a3b [TASK] Add PHP 8.4 lint to CI (thanks to Christian Kuhn)
• 2024-07-12 4502a5fe5b5 [TASK] Raise psr/http-factory:^1.1.0 (thanks to Christian Kuhn)
• 2024-07-12 6e071a2f54c [TASK] Properly set bcrypt cost (thanks to Christian Kuhn)
• 2024-07-12 06953346a10 [TASK] Raise phpunit as PHP 8.4 preparation (thanks to Christian Kuhn)
• 2024-07-09 3ce0a6b9d19 [TASK] composer u lolli42/finediff (thanks to Christian Kuhn)
• 2024-07-09 5ce6ee1aff0 [TASK] Allow PHP 8.4 in runTests.sh (thanks to Stefan Bürk)
• 2024-07-08 ea897dad2ee [BUGFIX] Fix Undefined array key "rootLevel" on import/preview (thanks to Loek Hilgersom)
• 2024-07-02 b437207ce36 [TASK] Ensure coding-style for nullable type declarations (thanks to Stefan Bürk)
• 2024-07-02 d0b4a232693 [TASK] Avoid implicitly nullable class method parameter in EXT:core (thanks to Stefan Bürk)
• 2024-07-01 332d6b5dd21 [TASK] Avoid implicitly nullable class method parameter in EXT:backend (thanks to Stefan Bürk)
• 2024-07-01 ff1feb9abcf [TASK] Avoid implicitly nullable class method parameter in EXT:opendocs (thanks to Stefan Bürk)
• 2024-07-01 cafa4558b33 [TASK] Avoid implicitly nullable class method parameter in EXT:viewpage (thanks to Stefan Bürk)
• 2024-07-01 296bcf78bdc [TASK] Avoid implicitly nullable class method parameter in EXT:recordlist (thanks to Stefan Bürk)
• 2024-07-01 89b399daa3e [TASK] Avoid implicitly nullable class method parameter in EXT:fluid (thanks to Stefan Bürk)
• 2024-07-01 5798087be73 [TASK] Fix CGL issues (thanks to Stefan Bürk)
• 2024-06-30 458a68c280f [TASK] Avoid implicitly nullable class method parameter in EXT:dashboard (thanks to Stefan Bürk)
• 2024-06-30 6da39dc0aca [TASK] Avoid implicitly nullable class method parameter in EXT:belog (thanks to Stefan Bürk)
• 2024-06-30 a0165157a4a [TASK] Avoid implicitly nullable class method parameter in EXT:adminpanel (thanks to Stefan Bürk)
• 2024-06-30 e6f15430aff [TASK] Avoid implicitly nullable class method parameter in EXT:beuser (thanks to Stefan Bürk)
• 2024-06-29 054dda798e8 [TASK] Avoid implicitly nullable class method parameter in EXT:extbase (thanks to Stefan Bürk)
• 2024-06-29 72471b2102a [BUGFIX] Fix invalid FormEngine HTML structure on edge-case (thanks to Garvin Hicking)
• 2024-06-28 8be86e859f0 [BUGFIX] Adapt ObjectConverter test with new symfony/property-info (thanks to Torben Hansen)
• 2024-06-28 6e2f50ae219 [TASK] Avoid implicitly nullable class method parameter in EXT:extensionmanager (thanks to Stefan Bürk)
• 2024-06-28 c7f042e5134 [TASK] Avoid implicitly nullable class method parameter in EXT:felogin (thanks to Stefan Bürk)
• 2024-06-28 e4daf09fcd8 [TASK] Avoid implicitly nullable class method parameter in EXT:form (thanks to Stefan Bürk)
• 2024-06-28 8b6609aa841 [TASK] Avoid implicitly nullable class method parameter in EXT:frontend (thanks to Stefan Bürk)
• 2024-06-28 ee2866331a7 [TASK] Avoid implicitly nullable class method parameter in EXT:indexed_search (thanks to Stefan Bürk)
• 2024-06-26 29dd10bfe39 [TASK] Avoid implicitly nullable class method parameter in EXT:linkvalidator (thanks to Stefan Bürk)
• 2024-06-26 fdcd7d73ec3 [TASK] Avoid implicitly nullable class method parameter in EXT:install (thanks to Stefan Bürk)
• 2024-06-26 5bc53853c90 [TASK] Disable failing unit-case test data set (thanks to Stefan Bürk)
• 2024-06-25 9265012f76e [TASK] Avoid implicitly nullable class method parameter in EXT:reports (thanks to Stefan Bürk)
• 2024-06-25 26863f5a269 [TASK] Avoid implicitly nullable class method parameter in EXT:rte_ckeditor (thanks to Stefan Bürk)
• 2024-06-25 ce5a0e64065 [TASK] Avoid implicitly nullable class method parameter in EXT:scheduler (thanks to Stefan Bürk)
• 2024-06-25 39b788d6528 [TASK] Adjust database support for runTests.sh (thanks to Stefan Bürk)
• 2024-06-25 878ab6628d1 [TASK] Allow additional composer options for -s composerInstall (thanks to Stefan Bürk)
• 2024-06-25 173c1615131 [BUGFIX] Silence regexp pattern errors in EXT:redirects (thanks to Stefan Bürk)
• 2024-06-25 b00e20a9b8e [TASK] Avoid implicitly nullable class method parameter in EXT:sys_note (thanks to Stefan Bürk)
• 2024-06-25 825f4fd9d40 [TASK] Avoid implicitly nullable class method parameter in EXT:seo (thanks to Stefan Bürk)
• 2024-06-24 4a574c76fba [TASK] Avoid implicitly nullable class method parameter in EXT:workspaces (thanks to Stefan Bürk)
• 2024-06-24 078baa6cf92 [TASK] Avoid implicitly nullable class method parameter in EXT:redirects (thanks to Stefan Bürk)
• 2024-06-23 06043aeb52c [TASK] Avoid implicitly nullable class method parameter in tests (thanks to Stefan Bürk)
• 2024-06-21 c5a253135a2 [BUGFIX] Fix array access error in EditableRestriction (thanks to Sybille Peters)
• 2024-06-21 ce879bfd35d [DOCS] Add hint to EXT:redirects regarding LinkHandler (thanks to Peter Kraume)
• 2024-06-21 c25ea7b0747 [BUGFIX] Fix backend page tree filter with special characters (thanks to Garvin Hicking)
• 2024-06-19 1dbe88a640e [BUGFIX] Make ContentRenderer catch more errors (thanks to Sascha Egerer)
• 2024-06-18 c664575232c [BUGFIX] Allow to open info modal window (thanks to Daniel Gohlke)
• 2024-06-18 45d8e094975 [BUGFIX] Avoid race condition in DocumentService.ready() (thanks to Benjamin Franzke)
• 2024-06-18 3f6343282be [TASK] Avoid runTests.sh -e (thanks to Christian Kuhn)
• 2024-06-18 8b6c1e1f389 [TASK] Avoid runTests.sh -o (thanks to Christian Kuhn)
• 2024-06-14 6c1cdf8a44d [DOCS] Properly document modulename registration for EXT:adminpanel (thanks to Bingquan Bao)
• 2024-06-13 468a8b553b2 [DOCS] Correct information about slug postModifiers (thanks to Georg Ringer)
• 2024-06-13 5d2fae27d4b [DOCS] Note about reserved keywords for Extbase arguments ("format") (thanks to Garvin Hicking)
• 2024-06-12 f5f3d36ec71 [TASK] Reduce memory usage of a greedy unit test (thanks to Christian Kuhn)
• 2024-06-11 c4c44e68fea [DOC] Use integers for examples of saveAndClose configuration (thanks to Georg Ringer)
• 2024-06-11 a855aad770b [TASK] Set TYPO3 version to 11.5.39-dev (thanks to Oliver Hader)