CVE-2026-8139: Concrete CMS is vulnerable to Stored XSS via external-link page cvName

May 22, 2026 (updated June 24, 2026)

Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via external-link page cvName because updateCollectionAliasExternal bypasses being sanitized.

References

documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
github.com/advisories/GHSA-pcrh-gj77-j4mw
nvd.nist.gov/vuln/detail/CVE-2026-8139

Code Behaviors & Features

Detect and mitigate CVE-2026-8139 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 →