HIGH

GHSA-g82f-9pw7-773w

Concrete CMS: PHP Object Injection via unserialize() calls

Quick fix

GHSA-g82f-9pw7-773w — concrete5/concrete5: upgrade to the fixed version with the command below.

composer require concrete5/concrete5:^9.5.2

Details

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.

Are you affected?

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Affected packages

Packagist / concrete5/concrete5

Introduced in: 0 Fixed in: 9.5.2

Fix composer require concrete5/concrete5:^9.5.2

References

https://nvd.nist.gov/vuln/detail/CVE-2026-10721 [ADVISORY]
https://documentation.concretecms.org/9-x/developers/introduction/version-history/952-release-notes [WEB]
https://github.com/concretecms/concretecms [PACKAGE]