Vulnerability record · CVE-2026-93872 · published 18 September 2026

CVE-2026-93872: Deserialization of untrusted data vulnerability

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.

7.7 CVSS 4.0 High EPSS 0.71% · top 48.4% CWE-502 · Deserialization of untrusted data Deferred

7.7CVSS 4.0 base score

0.71%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

6References

22 Sep 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:H/AT:P/PR:L/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:

References

Link	Tags
https://github.com/Cotonti/Cotonti
https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/controllers/actions/EditAction.php
https://github.com/Cotonti/Cotonti/blob/1.0.0/system/cache.php
https://github.com/Cotonti/Cotonti/issues/1894
https://github.com/Cotonti/Cotonti/pull/1897
https://www.vulncheck.com/advisories/cotonti-1.0.0-php-object-injection-via-comments-plugin-edit-action-cb-parameter

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Source: NIST National Vulnerability Database (record CVE-2026-93872), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.