TYPO3 vulnerable to Cross-Site Scripting in the ShowImageController

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS

• CVE-2024-34357: 0.50% estimated exploitation activity in the next 30 days; percentile 43.05 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Problem Failing to properly encode user-controlled values in file entities, the ShowImageController (eID txcmsshowpic) is vulnerable to cross-site scripting. Exploiting this vulnerability requires a valid backend user account with access to file entities. Solution Update to TYPO3 versions 9.5.48 ELTS, 10.4.45 ELTS, 11.5.37 LTS, 12.4.15 LTS, 13.1.1 that fix the problem described. Credits Thanks to TYPO3 security team member Torben Hansen who reported this issue and to TYPO3 core & security team member Oliver Hader who fixed the issue. References TYPO3-CORE-SA-2024-009

Published by the source

14 May 2024, 20:13 UTC

Last modified by the source

14 May 2024, 20:13 UTC

Source last checked

26 Oct 2026, 14:24 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-hw6c-6gwq-3m3m

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# Patch Next advisory brief: CVE-2024-34357

Advisory: TYPO3 vulnerable to Cross-Site Scripting in the ShowImageController
IDs: CVE-2024-34357, GHSA-hw6c-6gwq-3m3m
Record: https://patchnext.com/advisories/cve-2024-34357 (revision 1, source checked 26 Oct 2026, 14:24 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: typo3/cms-core 13.1.1, 12.4.15, 11.5.37, 10.4.45, 9.5.48. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist typo3/cms-core: affected >= 9.0.0, <= 9.5.47; >= 10.0.0, <= 10.4.44; >= 11.0.0, <= 11.5.36; >= 12.0.0, <= 12.4.14; >= 13.0.0, <= 13.1.0; fixed in 11.5.37, 9.5.48, 12.4.15, 10.4.45, 13.1.1

## Suggested inspection (read-only)
- Packagist typo3/cms-core: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on typo3/cms-core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hw6c-6gwq-3m3m (GitHub-reviewed advisory GHSA-hw6c-6gwq-3m3m lists affected ranges: Packagist typo3/cms-core >=9.0.0 =10.0.0 =11.0.0 =12.0.0 =13.0.0 <=13.1.0)

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