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HIGH

CVE-2026-87930

CVSS v3

8.1

HIGH

EPSS Score

0.6 %

exploit probability, as of 2026-09-28

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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.

Technical details

Published
2026-09-09
Last Modified
2026-09-09

Frequently asked questions

What is CVE-2026-87930?

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.

Is CVE-2026-87930 actively exploited?

Active exploitation of CVE-2026-87930 has not been confirmed. Its EPSS score was 0.6% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-87930?

CVE-2026-87930 has a CVSS v3 base score of 8.1 (HIGH severity).

Is CVE-2026-87930 affecting your environment?

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