CVE-2026-7887: Concrete CMS: OAuth 2.0 Authorization-Code Handler Bypasses Account Status

May 22, 2026 (updated June 24, 2026)

For Concrete CMS 9.5.0 and below, OAuth 2.0 Authorization-Code Handler Bypasses Account Status. A user with uIsActive=0 (suspended, banned, terminated employee) can still authenticate via OAuth and receive valid API tokens.

References

documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
github.com/advisories/GHSA-f54h-78c9-c24h
nvd.nist.gov/vuln/detail/CVE-2026-7887

Code Behaviors & Features

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