PT-2026-89109 · Maxsite · Maxsite Cms

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CVE-2026-87929

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Published

2026-09-09

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Updated

2026-09-10

CVSS v3.1

9.8

Critical

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.

Exploit

Fix

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Weakness Enumeration

Related Identifiers

CVE-2026-87929

Affected Products

Maxsite Cms