What is CVE-2026-93872?

CVE-2026-93872 is a high-severity vulnerability in Cotonti, classified under Deserialization of Untrusted Data. CVSS score: 7.5/10. Published 2026-09-18.

How severe is CVE-2026-93872?

High severity. CVSS v3 base score is 7.5 out of 10.

Deserialization in Cotonti

CVE-2026-93872

Cotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without allowed_classes restriction in the comments plugin EditAction. Registered users with comment write permissions can instantiate arbitrary PHP objects and potentially achieve file write or code execution through gadget chains.

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Cotonti

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (issue-tracking, patch)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-93872?: CVE-2026-93872 is a high-severity vulnerability in Cotonti, classified under Deserialization of Untrusted Data. CVSS score: 7.5/10. Published 2026-09-18.
How severe is CVE-2026-93872?: High severity. CVSS v3 base score is 7.5 out of 10.