CVE-2026-7888

The record

Concrete CMS below 9.5.3 is vulnerable to PHP Object Injection via unserialize() calls in the Workflow, Form block, and File/Set components that lack the allowed_classes restriction. The Form block and File/Set sinks were addressed in 9.5.2; the Workflow component sinks were addressed in 9.5.3. An unauthenticated attacker may trigger arbitrary PHP object instantiation if a malicious serialized payload has been placed in the database. Thanks XananasX7 and Sanjorn Keeratirungsan (dizconnect) for independently reporting the original components, and sh4d0byss for reporting the Workflow component wasn't fixed in 9.5.2. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 8.4 with vector CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/ VC:H/VI:H/VA:H/SC:N/SI:N/SA:N.

Affected packages

Related vulnerabilities

• CVE-2026-114724 Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 contains an object injection… CWE-502
• CVE-2026-112081 A vulnerability was determined in hankcs HanLP up to 2.1.0-beta.64. CWE-502
• CVE-2026-96745 Deserialization of untrusted data in the command monitoring support of the MongoDB PHP… CWE-502
• CVE-2026-62107 Unauthenticated PHP Object Injection in Masteriyo - LMS <= 3.4.0 versions. CWE-502
• CVE-2026-62103 Unauthenticated PHP Object Injection in Everest Forms <= 3.6.0 versions. CWE-502
• CVE-2026-62105 Unauthenticated PHP Object Injection in ThemeREX Addons < 2.45.0 versions. CWE-502
• CVE-2026-73699 FileRun before 2026.3.0 contains a PHP object injection vulnerability that allows… CWE-502
• CVE-2026-82925 The Site Reviews WordPress plugin before 8.3.0 does not prevent request data from being… CWE-502