CVE-2026-77135 TYPO3 CVE debrief

Who should care

Defenders responsible for TYPO3 installations with the femanager extension should assess exposure and prioritize remediation to prevent potential unauthorized retrieval of sensitive user profile data. This includes verifying the femanager extension version and configuration, and reviewing compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

The CVE-2026-77135 vulnerability in the TYPO3 femanager extension allows unauthorized retrieval of frontend user profile data, potentially impacting user privacy and data protection compliance. Defenders should prioritize verifying exposure and restricting access to the affected plugins.

• Potential unauthorized retrieval of sensitive user profile data
• Increased risk of phishing or social engineering attacks using exposed user information
• Need for verification of femanager extension version and configuration
• Potential impact on user privacy and data protection compliance

Technical summary

The femanager extension for TYPO3 fails to verify that a requested user record matches the configured or logged-in target, allowing any visitor with access to the Detail or List plugin to retrieve another frontend user's profile data by supplying an arbitrary user ID. This vulnerability allows unauthorized retrieval of sensitive user profile data, including name, email, date of birth, and address. Defenders should prioritize verifying exposure of the femanager extension in their TYPO3 installations and restrict access to the Detail and List plugins.

Defensive priority

Defenders should prioritize verifying exposure of the femanager extension in their TYPO3 installations and restrict access to the Detail and List plugins.

Recommended defensive actions

• Verify exposure of the femanager extension in TYPO3 installations
• Restrict access to the Detail and List plugins
• Monitor for suspicious activity related to user profile data retrieval
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details about the vulnerability in the femanager extension. However, additional information about affected versions and remediation steps is limited. Defenders should verify the femanager extension version and configuration, and review compensating controls for exposed systems while remediation is scheduled and verified. The CVE Program record and NVD detail page offer source-provided CVE metadata and vulnerability assessment.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.