Cross-Site Request Forgery (CSRF)

Summary

TYPO3 is a free and open source Content Management Framework. 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 "DB Check Module" allows attackers to manipulate data through unauthorized actions. Users are advised to update to TYPO3 version 11.5.42 ELTS which fixes the described problem. There are no known workarounds for this issue. This issue affects typo3/cms-lowlevel and typo3/cms packages versions 11.0.0 through 11.5.41.