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    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.

    Published:Sep 9, 2026
    Last Modified:Sep 9, 2026
    EPS:Sep 9, 2026
    EPSS Score:
    CVSS Score:9.8

    Affected Products

    Vendor
    Max-3000
    Product
    Maxsite Cms

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-87930 (CVSS 9.2) — MaxSite CMS through 109.6 passes the ci_session cookie to unserialize() without class restrictions, allowing u…
    CVE-2026-87928 (CVSS 5.1) — MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the admin_page upload …
    CVE-2026-87927 (CVSS 8.8) — MaxSite CMS through 109.6 contains a local file inclusion vulnerability in the ajax and require-maxsite dispat…
    CVE-2026-70554 (CVSS 9.3) — MaxSite CMS contains a PHP object injection vulnerability that allows unauthenticated attackers to execute arb…
    CVE-2026-70553 (CVSS 9.3) — MaxSite CMS contains a remote code execution vulnerability that allows unauthenticated attackers to inject arb…
    CVE-2026-70552 (CVSS 9.3) — MaxSite CMS 109.5 and earlier contains an authentication bypass vulnerability in the AJAX dispatcher that allo…
    CVE-2026-3395 (CVSS 5.5) — A flaw has been found in MaxSite CMS up to 109.1. This impacts the function eval of the file application/maxsi…
    CVE-2025-12347 (CVSS 2.1) — A flaw has been found in MaxSite CMS up to 109. This issue affects some unknown processing of the file applica…
    CVE-2025-12346 (CVSS 2.1) — A vulnerability was detected in MaxSite CMS up to 109. This vulnerability affects unknown code of the file app…
    CVE-2022-25413 (CVSS 5.4) — Maxsite CMS v108 was discovered to contain a stored cross-site scripting (XSS) vulnerability via the parameter…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High