CVE-2020-11065: Cross-Site Scripting in TYPO3 CMS

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-05-13 · updated 2026-06-17
Weakness: CWE-79

Description

In TYPO3 CMS greater than or equal to 9.5.12 and less than 9.5.17, and greater than or equal to 10.2.0 and less than 10.4.2, 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. This has been fixed in 9.5.17 and 10.4.2.

Affected products

typo3: from 9.5.12 before 9.5.17; from 10.2.0 before 10.4.2 — fixed in 10.4.2, 9.5.17

How to fix

Upgrade to a fixed version: typo3 10.4.2, 9.5.17. Check the vendor advisory for mitigations.

References

https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4j77-gg36-9864
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4j77-gg36-9864

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