CVE-2021-35210: Contao

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

Contao 4.5.x through 4.9.x before 4.9.16, and 4.10.x through 4.11.x before 4.11.5, allows XSS. It is possible to inject code into the tl_log table that will be executed in the browser when the system log is called in the back end.

Affected products

• Contao Contao: from 4.5.0, before 4.9.16 (fixed in 4.9.16); from 4.10.0, before 4.11.5 (fixed in 4.11.5)

Published 2021-06-23. Last modified 2026-06-17.