TYPO3 is an enterprise content management system. Starting in version 9.0.0 and prior to versions 9.5.48 ELTS, 10.4.45 ELTS, 11.5.37 LTS, 12.4.15 LTS, and 13.1.1, the `ShowImageController` (`_eID tx_cms_showpic_`) lacks a cryptographic HMAC-signature on the `frame` HTTP query parameter (e.g. `/index.php?eID=tx_cms_showpic?file=3&...&frame=12345`). This allows adversaries to instruct the system to produce an arbitrary number of thumbnail images on the server side. TYPO3 versions 9.5.48 ELTS, 10.4.45 ELTS, 11.5.37 LTS, 12.4.15 LTS, 13.1.1 fix the problem described.
https://typo3.org/security/advisory/typo3-core-sa-2024-010
https://github.com/TYPO3/typo3/security/advisories/GHSA-36g8-62qv-5957
https://github.com/TYPO3/typo3/commit/df7909b6a1cf0f12a42994d0cc3376b607746142
https://github.com/TYPO3/typo3/commit/1e70ebf736935413b0531004839362b4fb0755a5
https://github.com/TYPO3/typo3/commit/05c95fed869a1a6dcca06c7077b83b6ea866ff14