Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the in Permission, Cache, and Search components
CVE-2026-10721

8.4HIGH

Key Information:

Vendor

Concrete Cms

Status
Concrete Cms
Vendor
CVE Published:
10 June 2026

What is CVE-2026-10721?

Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection viaĀ unserialize()Ā calls in theĀ Ā in Permission, Cache, and SearchĀ components. An unauthenticated attacker may trigger arbitrary PHP object instantiation if a malicious serialized payload has been placed in the database. Thanks XananasX7 forĀ reporting.

Affected Version(s)

Concrete CMS 5 <= 9.5.1

References

https://documentation.concretecms.org/9-x/developers/intr...
release-notes

CVSS V4

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

XananasX7
.