Here is a list of what was fixed since 11.5.17:

• 2022-11-08 dc37806730 [RELEASE] Release of TYPO3 11.5.18 (thanks to Oliver Hader)
• 2022-11-08 d2c466b04d [BUGFIX] Prevent resolving translated page with default slug (thanks to Stefan Bürk)
• 2022-11-08 bdeeb0cf96 [BUGFIX] Speed up FormEngine with hundreds of categories (thanks to Benni Mack)
• 2022-11-08 f08f151e85 [BUGFIX] Fix serialization of LazyLoadingProxy and LazyObjectStorage (thanks to Alexander Schnitzler)
• 2022-11-08 493ab88f13 [BUGFIX] Fix PHP warning in RTE parseFunc option prefixRelPathWith (thanks to Benni Mack)
• 2022-11-08 1b52899c0a [TASK] Ensure to have a default showitem info when adding plugins as CType (thanks to Benni Mack)
• 2022-11-08 5e63517d30 [BUGFIX] Avoid PHP warnings in recycler for records without cruser_id (thanks to Georg Ringer)
• 2022-11-07 b8e600235e [BUGFIX] Use current link text in link hook (thanks to Roman Büchler)
• 2022-11-07 407aacf8bd [BUGFIX] Hide removed doktypes in page tree toolbar (thanks to Achim Fritz)
• 2022-11-07 fb60c52640 [BUGFIX] Prevent passing null to mb_strtolower in CaseViewHelper (thanks to Achim Fritz)
• 2022-11-07 d0163f30de [BUGFIX] Prevent undefined array key in new content element wizard (thanks to Achim Fritz)
• 2022-11-07 030ff7063a [BUGFIX] Properly align new content wizard items (thanks to Oliver Bartsch)
• 2022-11-07 21ca938550 [BUGFIX] Allow custom foreign_table_where for TCA type category (thanks to Oliver Bartsch)
• 2022-11-06 fee47a860c [BUGFIX] Clean up TCA Tree code base (thanks to Benni Mack)
• 2022-11-04 525aa18bd0 [BUGFIX] Make search by ID filter in pagetree work with modified records (thanks to Benni Mack)
• 2022-11-04 551f540fc3 [BUGFIX] Have CKEditor link plugin keep tags (thanks to Benni Mack)
• 2022-11-04 8ac62f5494 [BUGFIX] Respect prefers-reduced-motion for notifications (thanks to Andreas Fernandez)
• 2022-11-04 a13da62dae [TASK] Disable xdebug for phpstan command execution (thanks to Stefan Bürk)
• 2022-11-04 7afa11a141 [BUGFIX] Resolve modified slugs in versioned pages of preview (thanks to Benni Mack)
• 2022-11-03 462adaed4d [BUGFIX] Harden LocalizationUtility with empty arguments (thanks to Georg Ringer)
• 2022-11-03 255d0fb6fc [BUGFIX] Allow LIVE workspace preview for BE users without LIVE editing permission (thanks to Eric Bode)
• 2022-11-03 f68873a878 [TASK] Update to PHPStan 1.9.0 (thanks to Oliver Klee)
• 2022-11-02 3a3eaceb34 [BUGFIX] Properly encode error messages in FileController (thanks to Oliver Hader)
• 2022-10-31 203dc169af [BUGFIX] Check if variable exists before passing it to json_decode (thanks to Albrecht Koehnlein)
• 2022-10-29 12f6d1ddf2 [TASK] Update phpstan-phpunit to 1.2.2 (thanks to Wouter Wolters)
• 2022-10-27 1ff887ccb4 [TASK] Raise friendsofphp/php-cs-fixer:^3.12.0 (thanks to Wouter Wolters)
• 2022-10-26 a8ac74364d [TASK] Do not scan property '$content' in extension scanner (thanks to Christian Kuhn)
• 2022-10-25 be6ba983fa [BUGFIX] Avoid undefined array key frequencyOptions (thanks to Simon Ackermann)
• 2022-10-25 627d2bae49 [TASK] Update to PHPStan 1.8.11 (thanks to Oliver Klee)
• 2022-10-24 3304a26c9b [BUGFIX] Correct spellings and add translations (thanks to Chris Müller)
• 2022-10-22 2b4f8790ee [BUGFIX] Handle InsufficientFolderAccessPermissions in FileTree search (thanks to Markus Klein)
• 2022-10-22 4e5dab5c05 [BUGFIX] Render multi item clipboard actions if clipboard is available (thanks to Andreas Fernandez)
• 2022-10-22 e308920766 [BUGFIX] Interpolate log messages in InMemoryLogWriter (thanks to Sascha Egerer)
• 2022-10-21 0d2555cfc0 [BUGFIX] Animate docheader folding via CSS transitions (thanks to Andreas Fernandez)
• 2022-10-21 2dc49ec618 [BUGFIX] Add basic validation for email and phone links (thanks to Andreas Fernandez)
• 2022-10-21 ea8ec41e2f [BUGFIX] Avoid assigning null to string property (thanks to Anja Leichsenring)
• 2022-10-21 46a24a0be0 [BUGFIX] Always send strings to the method createStream (thanks to Michael Vöhringer)
• 2022-10-20 da2fb6d22e [BUGFIX] Use local TypoScriptFrontendController in nested ContentObjects (thanks to Andreas Kießling)
• 2022-10-20 d3528fcb17 [BUGFIX] Backend user table: title of "edit" button (thanks to Markus Zipfel)
• 2022-10-20 f2d03dc5a7 [BUGFIX] Avoid undefined array key "exclude" in RemoteServer (thanks to Chris Müller)
• 2022-10-19 38b9c42b6e [TASK] Improve type annotations for ExpressionBuilder::literal() (thanks to Oliver Klee)
• 2022-10-19 9baf7a4ff2 [TASK] Avoid direct usages to Doctrine/DBAL and ext-pdo (thanks to Benni Mack)
• 2022-10-19 2e7e438fd0 [BUGFIX] Cover multi-value properties in form editor with HMAC (thanks to Oliver Hader)
• 2022-10-18 2328e14a80 [TASK] Add iterable types to methods in TypoLinkCodecService (thanks to Elias Häußler)
• 2022-10-18 7d4efa3856 [BUGFIX] Use correct table identifier for collapse state in record list (thanks to Andreas Fernandez)
• 2022-10-17 6ebd696227 [BUGFIX] Handle flexform in BU::getProcessedValue() only if not null (thanks to Andreas Fernandez)
• 2022-10-15 4a4cfea9a7 [BUGFIX] Avoid undefined array key in FlexFormTools (thanks to Johannes Przymusinski)
• 2022-10-14 d1941f1364 [BUGFIX] Assure a string is passed to octdec function (thanks to Elias Häußler)
• 2022-10-14 7c82be9b7d [BUGFIX] Fix PHP warning when checking for resource collection object (thanks to Felix Nagel)
• 2022-10-14 c7ed730aff [TASK] Add .gitignore for JetBrains Fleet editor (thanks to Stefan Bürk)
• 2022-10-14 4efdc1aa25 [TASK] Update to PHPStan 1.8.9 (thanks to Oliver Klee)
• 2022-10-14 1c7b55e13b [BUGFIX] Avoid undefined array key for bodyTagCObject (thanks to Karsten Nowak)
• 2022-10-13 2428c347a9 [TASK] Add tests for GeneralUtility::implodeAttributes (thanks to Benni Mack)
• 2022-10-12 667083f92e [BUGFIX] Fix short scheduler:run options in documentation (thanks to Christian Weiske)
• 2022-10-12 dedbbcfbb0 [TASK] Update coding styleguide to PER + additional configs (thanks to Benni Mack)
• 2022-10-11 f45e223ff5 [BUGFIX] Avoid undefined array key in PageRepository (thanks to Christian Kuhn)
• 2022-10-11 e63196b324 [BUGFIX] Avoid undefined array key in FE PageLinkBuilder (thanks to Christian Kuhn)
• 2022-10-11 f754f7c776 [BUGFIX] Avoid undefined array key in FE RequestHandler (thanks to Christian Kuhn)
• 2022-10-11 bcdd7b16e9 [BUGFIX] Avoid undefined array key "updateReferenceIndex" in Extbase (thanks to Chris Müller)
• 2022-10-11 3900b1ea7d [TASK] Set TYPO3 version to 11.5.18-dev (thanks to Benni Mack)