CVE-2026-4202 is a vulnerability classified under CWE-862 (Missing Authorization) found in the TYPO3 CMS extension "Redirect Tabs." The issue stems from the extension's failure to properly verify whether an authenticated user has the appropriate permissions to access redirect records during page editing operations. As a result, users with limited privileges can view redirect configurations they should not be authorized to see. The affected versions include 0, 3.0.0, and 4.0.0 of the extension. The vulnerability does not require user interaction beyond authentication and has a CVSS 4.0 base score of 2.3, indicating low severity. The attack vector is network-based with low complexity, requiring privileges but no additional user interaction. The impact is limited to confidentiality, with no integrity or availability effects reported. No patches or known exploits are currently available, and the vulnerability was publicly disclosed on March 17, 2026. This issue highlights the importance of robust authorization checks in CMS extensions to prevent unauthorized data exposure.

The primary impact of CVE-2026-4202 is unauthorized disclosure of redirect records within TYPO3 CMS installations using the vulnerable "Redirect Tabs" extension. While the confidentiality of redirect configurations is compromised, the vulnerability does not allow attackers to modify redirects, escalate privileges, or disrupt service availability. This exposure could aid attackers in reconnaissance by revealing internal redirect structures, potentially facilitating further targeted attacks or social engineering. Organizations relying on TYPO3 for content management and using this extension may face risks related to information leakage, especially if redirect data contains sensitive URLs or internal routing logic. However, the low CVSS score and requirement for authenticated access limit the overall risk. The absence of known exploits reduces immediate threat but does not eliminate the need for remediation. In environments with many users or complex permission schemes, the risk of unauthorized access to redirect data is more pronounced.

To mitigate CVE-2026-4202, organizations should first verify and restrict user permissions within TYPO3 to ensure that only authorized users can access redirect management features. Administrators should audit roles and privileges associated with the "Redirect Tabs" extension and remove unnecessary access rights. Until an official patch is released, consider disabling the extension if redirect management is not critical or isolating its use to trusted administrators. Monitor TYPO3 security advisories for updates or patches addressing this vulnerability and apply them promptly. Implement logging and alerting on access to redirect records to detect potential unauthorized access attempts. Additionally, conduct regular security reviews of all CMS extensions to ensure proper authorization controls are in place. Employ network segmentation and access controls to limit exposure of the TYPO3 backend to trusted networks and users only.