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CVE-2021-35210: Cross site scripting in the system log

July 1, 2021 (updated April 17, 2025)

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.

References

  • contao.org/en/security-advisories/cross-site-scripting-in-the-system-log-2021.html
  • github.com/FriendsOfPHP/security-advisories/blob/master/contao/contao/CVE-2021-35210.yaml
  • github.com/FriendsOfPHP/security-advisories/blob/master/contao/core-bundle/CVE-2021-35210.yaml
  • github.com/advisories/GHSA-h58v-c6rf-g9f7
  • github.com/contao/contao
  • github.com/contao/contao/security/advisories/GHSA-h58v-c6rf-g9f7
  • nvd.nist.gov/vuln/detail/CVE-2021-35210

Code Behaviors & Features

Detect and mitigate CVE-2021-35210 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions starting from 4.5.0 before 4.9.16, all versions starting from 4.10.0 before 4.11.5

Fixed versions

  • 4.9.16
  • 4.11.5

Solution

Upgrade to versions 4.11.5, 4.9.16 or above.

Impact 6.1 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Learn more about CVSS

Weakness

  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Source file

packagist/contao/core-bundle/CVE-2021-35210.yml

Spotted a mistake? Edit the file on GitLab.

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