CVE-2026-10721
High
Description
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. Thanks XananasX7 for reporting.
SeverityHigh
CVSS8.4
Exploit probability—
ProductConcrete5/concrete5
PublishedJun 10, 2026
First seenJun 10, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- concrete5/concrete59.5.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| concrete5/concrete5Packagist | v < 9.5.2 | 9.5.2 |
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