Summary
It has been discovered that link tags generated by typolink functionality are vulnerable to cross-site scripting - properties being assigned as HTML attributes have not been parsed correctly.
Update to TYPO3 versions 9.5.17 or 10.4.2 that fix the problem described.
References
Impact
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.
CVE-2020-11065 has a CVSS score of 5.4 (Medium). The vector is network-reachable, low 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 (10.4.2, 9.5.17); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
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. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
typo3/cms-core to 10.4.2 or later; typo3/cms-core to 9.5.17 or later; typo3/cms to 10.4.2 or later; typo3/cms to 9.5.17 or later
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2020-11065? CVE-2020-11065 is a medium-severity cross-site scripting (XSS) vulnerability in typo3/cms-core (composer), affecting versions >= 10.0.0, < 10.4.2. It is fixed in 10.4.2, 9.5.17. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
- How severe is CVE-2020-11065? CVE-2020-11065 has a CVSS score of 5.4 (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.
- Which packages are affected by CVE-2020-11065?
typo3/cms-core(composer) (versions >= 10.0.0, < 10.4.2)typo3/cms(composer) (versions >= 10.0.0, < 10.4.2)
- Is there a fix for CVE-2020-11065? Yes. CVE-2020-11065 is fixed in 10.4.2, 9.5.17. Upgrade to this version or later.
- Is CVE-2020-11065 exploitable, and should I be worried? Whether CVE-2020-11065 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
- What actually determines whether CVE-2020-11065 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.
- How do I fix CVE-2020-11065?
- Upgrade
typo3/cms-coreto 10.4.2 or later - Upgrade
typo3/cms-coreto 9.5.17 or later - Upgrade
typo3/cmsto 10.4.2 or later - Upgrade
typo3/cmsto 9.5.17 or later
- Upgrade