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CVE-2026-46725 — TYPO3 Remote Code Execution in mmc/ceselector —...

CRITICAL

TYPO3 Remote Code Execution in extension "Content Element Selector" (ceselector)

Published May 19, 2026Updated September 10, 2026Source: osv

Summary

The TYPO3 "Content Element Selector" (ceselector) extension passes an attacker-controlled cookie directly to PHP's `unserialize()` without safely processing the input. A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server. Exploitation requires the content element to be configured with `Persistent Mode: Static` in the plugin settings. This has been patched in version 3.0.3, 4.0.2, 5.0.1, and 6.0.1.

Advisory Timeline

  • First published May 19, 2026 (146 days ago).
  • Last revised September 10, 2026 — 114 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer
Update mmc/ceselector to 6.0.1 or later
composer require "mmc/ceselector:^6.0.1"
Composer
Update mmc/ceselector to 3.0.3 or later
composer require "mmc/ceselector:^3.0.3"
Composer
Update mmc/ceselector to 5.0.1 or later
composer require "mmc/ceselector:^5.0.1"
Composer
Update mmc/ceselector to 4.0.2 or later
composer require "mmc/ceselector:^4.0.2"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (4)

Affects 1 ecosystem: packagist (1).

PackageEcosystemAffectedFixed In
mmc/ceselector
packagist
6.0.06.0.1
mmc/ceselector
packagist
2.0.0, 2.0.1, 2.0.2, 2.0.3 (+4 more)3.0.3
mmc/ceselector
packagist
5.0.05.0.1
mmc/ceselector
packagist
4.0.0, 4.0.14.0.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.3 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

Frequently Asked Questions

What is CVE-2026-46725?
TYPO3 Remote Code Execution in extension "Content Element Selector" (ceselector) This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.3/10).
How do I check if my project is affected by CVE-2026-46725?
CVE-2026-46725 affects mmc/ceselector. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-46725 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.3

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-8x3j-439w-537c

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