UpHeron
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Servers and applications

CVE-2021-35210

Cross-site scripting in the system log

Severity
Medium 6.1
Published
23 Jun 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.9.16, 4.11.5
Also known as
GHSA-h58v-c6rf-g9f7
Sources
NVD, Project advisories (GitHub)

Description

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 software

SoftwareAffected versions
ContaoServers and applications · cpe:a:contao:contao
  • From 4.5.0 before 4.9.16
  • From 4.10.0 before 4.11.5
ContaoServers and applications · github:contao/contao
  • From 4.5.0 before 4.9.16

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-35210
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-35210
  • GitHub Advisory Database https://github.com/advisories/GHSA-h58v-c6rf-g9f7
  • github.com https://github.com/contao/contao/security/advisories/GHSA-h58v-c6rf-g9f7