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Back to active CVEs
Critical · CVSS 9.3CVE-2026-87929

MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption KeyCVE-2026-87929

Answer in brief

CVE-2026-87929 records a Critical severity (CVSS 9.3) vulnerability in MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key. The current sources do not mark it as known exploited. The current feed maps MaxSite/MaxSite CMS (generic), MaxSite/MaxSite CMS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 9, 2026Updated Sep 24, 2026Source checked Oct 25, 2026First seen by HOL Sep 9, 2026Material review Sep 24, 2026
Upstream Advisory

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-321
Source
CVE List V5
Source checked
Oct 25, 2026
References
5 linked sources
Open source record

Key facts

Risk
Critical · CVSS 9.3
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps MaxSite/MaxSite CMS (generic), MaxSite/MaxSite CMS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
MaxSite/MaxSite CMSgeneric0.78Not reported
MaxSite/MaxSite CMSgeneric>=0.78 <=109.6Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for MaxSite/MaxSite CMS, MaxSite/MaxSite CMS.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Sep 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 9, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.