CRITICALVulnerability
CVE-2026-87929
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.
Properties
- severity
- CRITICAL
- score
- 9.8
- cve_id
- CVE-2026-87929
- signal_observed_at
- 2026-09-17T21:32:24+00:00
- vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- published_at
- 2026-09-09T17:17:53.840
- last_modified
- 2026-09-14T14:17:18.670
Related Entities (2)
HAS_WEAKNESS (1)
→[Weakness]Use of Hard-coded Cryptographic Key
DESCRIBED_BY (1)
→[Source]NVD
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