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CVE-2026-87929— MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key

Quick assessment

Affected
MaxSite MaxSite CMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MaxSite CMS（版本 109.6 及之前）在 中内置了一个硬编码的会话加密密钥，该密钥在安装过程中从未被修改。这允许未经身份验证的攻击者伪造管理员会话 Cookie。 攻击者可以使用公开的加密密钥，通过计算 HMAC-SHA1 哈希值，生成一个具有管理员权限的恶意 Cookie，从而绕过 和 函数中的身份验证检查。

CVSS 9.8 · Critical
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I. Basic Information for CVE-2026-87929

Vulnerability Information
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Vulnerability Title
MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的密码学密钥
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MaxSite MaxSite CMS 0.78 ~ 109.6 -

II. Public POCs for CVE-2026-87929

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III. Intelligence Information for CVE-2026-87929

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Vendor Pages for CVE-2026-87929 (1)

Other References for CVE-2026-87929 (4)

Same Patch Batch · MaxSite · 2026-09-09 · 4 CVEs total

CVE-2026-87927 8.2 HIGH MaxSite CMS through 109.6 Local File Inclusion via ajax dispatcher
CVE-2026-87930 8.1 HIGH MaxSite CMS through 109.6 PHP Object Injection via ci_session
CVE-2026-87928 5.4 MEDIUM MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page

IV. Related Vulnerabilities

Same product: MaxSite CMS
Same vendor: MaxSite
Same weakness: CWE-321

V. Comments for CVE-2026-87929

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