CVE-2026-87929 MaxSite CMS - Authentication Bypass

MaxSite CMS through 109.6 contains a broken authentication caused by a hardcoded session encryption key in application/config/config.php, letting unauthenticated attackers forge administrator session cookies, exploit requires knowledge of the hardcoded key.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.53% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
9 September 2026
Updated
15 October 2026
Weakness
CWE-321

Vendor fix

Update to a version that removes the hardcoded session encryption key or change the key during installation.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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