PoC Index85,080 CVEs with PoCs

CVE-2026-87930

MaxSite CMS through 109.6 PHP Object Injection via ci_session

CRITICAL 9.2EPSS 0.6%

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.

Affected
MaxSite · MaxSite CMS
CVSS v4.0 VULNCHECK
9.2 CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 VULNCHECK
8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
0.61% chance of exploitation in the next 30 days, 48th percentile
Published
2026-09-09
Updated
2026-09-24

Proof-of-concept exploits (2)

References

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