---
id: CVE-2026-93872
title: >-
  Cotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without
  allowed_classes restriction in the comments plugin EditAction
summary: >-
  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
  potent…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-502
vendor: Cotonti
product: Cotonti
affected:
  - Cotonti >= 1.0.0 <= 1.0.0
published: '2026-09-18'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:53:07.383'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93872'
references:
  - url: 'https://github.com/Cotonti/Cotonti'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/controllers/actions/EditAction.php
    label: disclosure@vulncheck.com
  - url: 'https://github.com/Cotonti/Cotonti/blob/1.0.0/system/cache.php'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/Cotonti/Cotonti/issues/1894'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/Cotonti/Cotonti/pull/1897'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/cotonti-1.0.0-php-object-injection-via-comments-plugin-edit-action-cb-parameter
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.0071
epssPercentile: 0.5146
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-21T16:42:41.893793Z'
ingestedAt: '2026-09-18T20:51:25.689Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.