CVE-2026-68534: Improper Neutralization of Input During Web Page Generation

Concrete CMS before 9.5.3 rendered Express entry labels as raw HTML when displaying associated entries, resulting in stored cross-site scripting. An unauthenticated attacker could submit a payload through a public Express Form; it then executed in an administrator's dashboard session when the...

GHSA-PV2V-6W2V-97X6 Concrete CMS Vulnerable to Deserialization of Untrusted Data

Concrete CMS 9.5.0 and below is vulnerable to Remote Code Execution due to insecure deserialization occurring in the ExpressEntryList block controller. An rogue administrator with privileges to add blocks to an area can bypass the intended protection mechanism fromCIF === true, which normally...

CVE-2026-8135 Concrete CMS 9.5.0 and below is vulnerable to RCE due to insecure deserialization occurring in the ExpressEntryList block controller.

Concrete CMS 9.5.0 and below is vulnerable to Remote Code Execution due to insecure deserialization occurring in the ExpressEntryList block controller. An rogue administrator with privileges to add blocks to an area can bypass the intended protection mechanism fromCIF === true, which normally...

Deserialization of Untrusted Data

Overview Affected versions of this package are vulnerable to Deserialization of Untrusted Data via the columns parameter in the Express Entry List block configuration. An attacker can execute arbitrary code on the server by injecting crafted serialized data that is later processed without proper...

Concrete CMS vulnerable to Remote Code Execution by stored PHP object injection

Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to...

GHSA-GJ26-W59C-29MF Concrete CMS vulnerable to Remote Code Execution by stored PHP object injection

Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to...

EUVD-2026-9356

Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to...

CVE-2026-3452

Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to...

CVE-2026-3452 Concrete CMS below 9.4.8 is vulnerable to stored deserialization leading to RCE in the Express Entry List block.

Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to...

CVE-2026-3452 Concrete CMS below 9.4.8 is vulnerable to stored deserialization leading to RCE in the Express Entry List block.

Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to...

CVE-2026-3452

Concrete CMS versions below 9.4.8 are vulnerable to Remote Code Execution via stored PHP object injection in the Express Entry List block, using the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed ...

PT-2026-22863

Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system designed for teams. Versions of Concrete CMS prior to 9.4.8 contained a security vulnerability. This vulnerability stemmed from PHP object injection in the columns parameter within the Express Entry List block, which could lead to remote co...

CVE-2026-3452: Deserialization of Untrusted Data

Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to...