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CVE-2026-87929

MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key

CVSS 4.0 9.3 CRITICALCVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-87929

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-87929

Published

MaxSite CMS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "vendor": "MaxSite",
                    "product": "MaxSite CMS",
                    "packageURL": "pkg:github/maxsite/cms",
                    "repo": "https://github.com/maxsite/cms",
                    "versions": [
                        {
                            "version": "0.78",
                            "lessThanOrEqual": "109.6",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON