CVE-2026-93872

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Cotonti

PublishedSep 18, 2026

First seenSep 18, 2026

Weakness typeCWE-502Deserialization of untrusted data

How to fix

Patches

github.com/Cotonti/Cotonti/pull/1897

Affected products

Product	Affected versions	Fixed in
Cotonti Cotonti	1.0.0	—

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