Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget
High-risk advisory
CVE-2026-55790
Summary
Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget
Why it matters
GitHub has published a reviewed security advisory for craftcms/cms. Prioritize it with other application dependency updates, especially because EPSS places it in the 23% percentile.
Operator check
Check whether craftcms/cms is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 7.4. EPSS probability: 0.3%; percentile: 23%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.