Security Advisory

CVE-2026-87929

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-09-09 16:45:00

Last updated 2026-09-14 13:40:25

Assigner VulnCheck

CVSS score 9.8

State PUBLISHED

Description

MaxSite CMS through 109.6 ships with a hardcoded session encryption key in application/config/config.php that is never changed during installation, allowing unauthenticated attackers to forge administrator session cookies. Attackers can mint a malicious ci_session cookie with administrator privileges by computing an HMAC-SHA1 using the publicly known encryption key, bypassing authentication checks in is_login() and mso_check_allow() functions.

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