🛡️ CVE-2024-55921 — typo3

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-352 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

TYPO3 Extension Manager Module vulnerable to Cross-Site Request Forgery

Problem

A vulnerability has been identified in the backend user interface functionality involving deep links. Specifically, this functionality is susceptible to Cross-Site Request Forgery (CSRF). Additionally, state-changing actions in downstream components incorrectly accepted submissions via HTTP GET and did not enforce the appropriate HTTP method.

Successful exploitation of this vulnerability requires the victim to have an active session on the backend user interface and to be deceived into interacting with a malicious URL targeting the backend, which can occur under the following conditions:

  • the user opens a malicious link, such as one sent via email.
  • the user visits a compromised or manipulated website while the following settings are misconfigured:

+ security.backend.enforceReferrer feature is disabled,

+ BE/cookieSameSite configuration is set to lax or none

The vulnerability in the affected downstream component “Extension Manager Module” allows attackers to retrieve and install 3rd party extensions from the TYPO3 Extension Repository - which can lead to remote code execution in the worst case.

Solution

Update to TYPO3 versions 11.5.42 ELTS, 12.4.25 LTS, 13.4.3 LTS that fix the problem described.

Credits

Thanks to TYPO3 core and security members Benjamin Franzke, Oliver Hader, Andreas Kienast, Torben Hansen, Elias Häußler who fixed the issue.

References

  • [TYPO3-CORE-SA-2025-006](https://typo3.org/security/advisory/typo3-core-sa-2025-006)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2024-55921 is classified as CWE-352: Cross-Site Request Forgery (CSRF). A state-changing request is accepted without proof it was intended, so another site can trigger it using the victim's session.

Affected software

CVE-2024-55921 is recorded against 2 packages.

  • typo3 (from 13.0.0 up to 13.4.3)
  • typo3/cms-extensionmanager (from 13.0.0 up to 13.4.3)

Timeline and source

Published on 14 January 2025 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
typo3.org

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE CWE-352
Public Exploit ✅ No
Source NVD
Published 2025-01-14
Updated 2026-08-12
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
typo3 13.0.0 13.4.3
typo3/cms-extensionmanager 13.0.0 13.4.3

Similar Threats

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