CVE-2026-87930
High
Description
MaxSite CMS through 109.6 passes the ci_session cookie to unserialize() without class restrictions, allowing unauthenticated attackers to inject PHP objects. Attackers can forge valid session cookies using the hardcoded encryption key to trigger magic methods and corrupt application state or achieve code execution if gadget classes exist.
SeverityHigh
CVSS8.1
Exploit probability—
Product
MaxSite CMS
PublishedSep 9, 2026
First seenSep 9, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| MaxSite MaxSite CMS | 0.78 ≤ v ≤ 109.6 | — |
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