GHSA-8C25-VJ2W-P72J

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
• for regular frontend rendering (pattern can be defined individually using TypoScript setting config.USERNAME_substToken)

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

GHSA-8C25-VJ2W-P72J has a CVSS score of 6.1 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (8.7.21, 9.5.2, 7.6.32); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is GHSA-8C25-VJ2W-P72J? GHSA-8C25-VJ2W-P72J is a medium-severity cross-site scripting (XSS) vulnerability in typo3/cms-core (composer), affecting versions >= 8.0.0, < 8.7.21. It is fixed in 8.7.21, 9.5.2, 7.6.32. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. How severe is GHSA-8C25-VJ2W-P72J? GHSA-8C25-VJ2W-P72J has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of typo3/cms-core are affected by GHSA-8C25-VJ2W-P72J? typo3/cms-core (composer) versions >= 8.0.0, < 8.7.21 is affected.
4. Is there a fix for GHSA-8C25-VJ2W-P72J? Yes. GHSA-8C25-VJ2W-P72J is fixed in 8.7.21, 9.5.2, 7.6.32. Upgrade to this version or later.
5. Is GHSA-8C25-VJ2W-P72J exploitable, and should I be worried? Whether GHSA-8C25-VJ2W-P72J is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether GHSA-8C25-VJ2W-P72J is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix GHSA-8C25-VJ2W-P72J?
   • Upgrade typo3/cms-core to 8.7.21 or later
   • Upgrade typo3/cms-core to 9.5.2 or later
   • Upgrade typo3/cms-core to 7.6.32 or later

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