MaxSite CMS through 109.6 passes the ci_session cookie to unserialize() without class restrictions, allowing unauthenticated attackers to inject PHP objects. Attackers can forge valid session cookies using the hardcoded encryption key to trigger magic methods and corrupt application state or achieve code execution if gadget classes exist.
History

Wed, 09 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 09 Sep 2026 17:00:00 +0000

Type Values Removed Values Added
Description MaxSite CMS through 109.6 passes the ci_session cookie to unserialize() without class restrictions, allowing unauthenticated attackers to inject PHP objects. Attackers can forge valid session cookies using the hardcoded encryption key to trigger magic methods and corrupt application state or achieve code execution if gadget classes exist.
Title MaxSite CMS through 109.6 PHP Object Injection via ci_session
First Time appeared Max-3000
Max-3000 maxsite Cms
Weaknesses CWE-502
CPEs cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:*
Vendors & Products Max-3000
Max-3000 maxsite Cms
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-09-09T16:45:00.798Z

Updated: 2026-09-09T17:24:57.540Z

Reserved: 2026-09-09T16:12:38.084Z

Link: CVE-2026-87930

cve-icon Vulnrichment

Updated: 2026-09-09T17:24:52.802Z

cve-icon NVD

Status : Deferred

Published: 2026-09-09T17:17:53.990

Modified: 2026-09-09T20:14:00.420

Link: CVE-2026-87930

cve-icon Redhat

No data.