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GHSA-pcrh-gj77-j4mw

Concrete CMS is vulnerable to Stored XSS via external-link page cvName

Source: GitHub Advisory Database (reviewed) Low CVE-2026-8139

Packages

EcosystemPackageAffectedFixed in
Packagist concrete5/concrete5 < 9.5.1 9.5.1

Details

As written in the advisory (Markdown source, shown as plain text).

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

References

External links from the advisory. They lead to third-party sites.