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MEDIUM severity

TYPO3 Cross-Site Scripting in Frontend User LoginGHSA-8c25-vj2w-p72j

MEDIUM

GHSA-8c25-vj2w-p72j is a medium-severity (CVSS 6.1) vulnerability in typo3/cms-core. A fix is available for typo3/cms-core — see the affected versions and patch details below.

Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Dec 5, 2024 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

3 pkgs affected
🐘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

Failing to properly encode user input, login status display is vulnerable to cross-site scripting in the website frontend. A valid user account is needed in order to exploit this vulnerability - either a backend user or a frontend user having the possibility to modify their user profile.

Template patterns that are affected are

  • ###FEUSER_[fieldName]### using system extension felogin
  • <!--###USERNAME###--> for regular frontend rendering (pattern can be defined individually using TypoScript setting config.USERNAME_substToken)

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagisttypo3/cms-core≥ 8.0.0&&< 8.7.218.7.21composer require typo3/cms-core:^8.7.21
🐘Packagisttypo3/cms-core≥ 9.0.0&&< 9.5.29.5.2composer require typo3/cms-core:^9.5.2
🐘Packagisttypo3/cms-core≥ 7.1.0&&< 7.6.327.6.32composer require typo3/cms-core:^7.6.32

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 8.7.21 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8c25-vj2w-p72j 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

Failing to properly encode user input, login status display is vulnerable to cross-site scripting in the website frontend. A valid user account is needed in order to exploit this vulnerability - either a backend user or a frontend user having the possibility to modify their user profile. Template patterns that are affected are - ###FEUSER_[fieldName]### using system extension felogin - <!--###USERNAME###--> for regular frontend rendering (pattern can be defined individually using TypoScript setting config.USERNAME_substToken)
O3 Security · Impact-Aware SCA

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TYPO3 Cross-Site Scripting in Frontend User Login