CVE-2026-10721: Concrete CMS: PHP Object Injection via unserialize() calls

June 10, 2026 (updated August 12, 2026)

Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the in Permission, Cache, and Search components. An unauthenticated attacker may trigger arbitrary PHP object instantiation if a malicious serialized payload has been placed in the database. Concrete CMS thanks XananasX7 for reporting this issue.

References

documentation.concretecms.org/9-x/developers/introduction/version-history/952-release-notes
github.com/advisories/GHSA-g82f-9pw7-773w
nvd.nist.gov/vuln/detail/CVE-2026-10721

Code Behaviors & Features

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