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MEDIUM severity

TYPO3 vulnerable to Cross-Site Scripting in the ShowImageControllerGHSA-hw6c-6gwq-3m3m

MEDIUMFix: TYPO3/typo3@3764749

GHSA-hw6c-6gwq-3m3m is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in typo3/cms-core. A fix is available for typo3/cms-core — see the affected versions and patch details below.

Also known asCVE-2024-34357
Published
Updated
Affected
5 pkgs
Patched
5 / 5
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-hw6c-6gwq-3m3m.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs43th percentile — riskier than 43% of all scored CVEsHighest risk
0.00%0.38%0.76%1.13%0.6%0.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

5 pkgs affected
🐘typo3/cms-core🐘typo3/cms-core🐘typo3/cms-core🐘typo3/cms-core🐘typo3/cms-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Problem

Failing to properly encode user-controlled values in file entities, the ShowImageController (eID tx_cms_showpic) 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

Affected Packages

5 total 5 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagisttypo3/cms-core≥ 9.0.0&&< 9.5.489.5.48composer require typo3/cms-core:^9.5.48
🐘Packagisttypo3/cms-core≥ 10.0.0&&< 10.4.4510.4.45composer require typo3/cms-core:^10.4.45
🐘Packagisttypo3/cms-core≥ 11.0.0&&< 11.5.3711.5.37composer require typo3/cms-core:^11.5.37
🐘Packagisttypo3/cms-core≥ 12.0.0&&< 12.4.1512.4.15composer require typo3/cms-core:^12.4.15
🐘Packagisttypo3/cms-core≥ 13.0.0&&< 13.1.113.1.1composer require typo3/cms-core:^13.1.1

Affected Products

1 product · 5 configurations
Application
typo3typo3
≥ 13.0.0 && < 13.1.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3/cms-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update typo3/cms-core to 9.5.48 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hw6c-6gwq-3m3m is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Problem Failing to properly encode user-controlled values in file entities, the `ShowImageController` (_eID tx_cms_showpic_) 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-2024-00
O3 Security · Impact-Aware SCA

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TYPO3 vulnerable to Cross-Site Scripting in the…