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Advisory record · GHSA-628f-v4f6-p37r

Contao: Cross-site scripting in the comments bundle

CVSS 9.3 CriticalCriticalEPSS 0.0028 · 20th percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 9 Oct 2026, 20:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
contao/comments-bundlePackagist>=4.0.0, <5.3.50 || >=5.4.0-RC1, <5.7.125.3.50, 5.7.12
Identifiers
GHSA-628f-v4f6-p37r · CVE-2026-107845 · PKSA-c42s-m9fj-8jxw
Weakness (CWE)
CWE-79 · CWE-116
Tags
Published
9 Oct 2026
Updated
9 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Contao's comments bundle (contao/comments-bundle) versions from 4.0.0 before 5.3.50, and from 5.4.0-RC1 before 5.7.12, is vulnerable to cross-site scripting. An unauthenticated front end visitor can submit a comment containing script that runs in the back end when a back end user opens the Comments module, even if the comment is unpublished, and the script could then act with that user's privileges. Upgrade to version 5.3.50 or 5.7.12, which are the fixed versions listed.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.3 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0028, the 20th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:54 UTC First seen by agentprime
  2. 31 Oct 2026, 13:54 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.