---
id: CVE-2026-77138
title: >-
  The extension fails to safely process untrusted client input of an
  attacker-controlled cookie directly to PHP's unserialize()
summary: >-
  The extension fails to safely process untrusted client input of an
  attacker-controlled cookie directly to PHP's unserialize(). A remote,
  unauthenticated attacker can supply a crafted serialized payload to trigger
  PHP Object Injection, le…
severity: none
cwe:
  - CWE-502
published: '2026-08-25'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T23:10:00.143'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77138'
references:
  - url: 'https://typo3.org/security/advisory/typo3-ext-sa-2026-014'
    label: f4fb688c-4412-4426-b4b8-421ecf27b14a
tags:
  - nvd
ingestedAt: '2026-09-28T23:23:00.541Z'
---

## Overview

The extension fails to safely process untrusted client input of an attacker-controlled cookie directly to PHP's unserialize(). A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server.

## Remediation

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