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CVE-2026-77135 – Information Disclosure (IDOR) – TYPO3 femanager Extension < 6.4.5 / 7.5.5 / 8.4.2 /

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Summary

CVE-2026-77135 is a high-severity authorization bypass (Insecure Direct Object Reference / missing authorization check) in the "femanager" extension for TYPO3 CMS. The extension’s frontend user detail view does not 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 personal profile data simply by supplying an arbitrary user ID. The issue carries a CVSS score of 8.2 (High) and is remotely exploitable over the network with no authentication or user interaction required.

Technical details

  • Root cause: The femanager Detail/List plugin’s controller logic fails to check whether the requested frontend user record actually belongs to the currently logged-in user or matches the plugin’s configured target before rendering the record.
  • Trigger conditions: A page containing the femanager Detail or List plugin must be publicly reachable; the attacker supplies an arbitrary frontend user ID (e.g., via a URL/GET parameter) to the detail view.
  • Attack vector: Network-based, low attack complexity, no privileges or user interaction required (per the associated CVSS v4.0 vector).
  • Impact: Disclosure of another frontend user’s personally identifiable information, including name, email address, date of birth, and physical address — without needing valid credentials for that account.

Affected software

  • TYPO3 extension femanager (in2code/femanager), versions:
    • 6.4.4 and earlier
    • 7.0.0 – 7.5.4
    • 8.0.0 – 8.4.1
    • 13.0.0 – 13.3.4

Severity

  • CVSS Score: 8.2 (High)
  • CVSS v4.0 Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  • No CVSS v3.1 vector has been published for this specific CVE by the vendor at the time of writing.

Mitigation and recommended actions

  • Immediate: Upgrade the femanager extension to the patched release for your branch:
    • 6.x → 6.4.5
    • 7.x → 7.5.5
    • 8.x → 8.4.2
    • 13.x → 13.3.5
  • If patching is not immediately possible:
    • Restrict or disable public access to pages using the femanager Detail and List plugins until the update can be applied.
    • Monitor frontend access logs for anomalous, sequential, or scripted requests to detail-view URLs with varying user ID parameters.
    • Limit exposure of sensitive frontend user fields (email, date of birth, address) in templates rendered by the affected plugins as a defense-in-depth measure.

References

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