vulnerability · Fri 09 Oct 2026 · 20:53 UTC
GHSA-628f-v4f6-p37r: Contao: Cross-site scripting in the comments bundle
Filed UTCSource GTH ↗
An unauthenticated front end visitor can post a comment containing a XSS injection. The victim is any back end user who opens the Comments module, and moderation makes exposure certain rather than preventing it. No Content-Security-Policy header is sent on the Contao back end, so nothing mitigates the inline handler. ### Impact Anyone on the internet can inject script that executes in the Contao back end origin, under the session of whichever user opens the Comments module, with no click and no hover. …
Signals
as the pipeline stamped them- High
- Critical vulnerability — CVSS 9.3
- What to do
- Critical severity — schedule an urgent patch.
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-107845 | — | 0.27% | NVD ↗ |
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