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CVE-2026-77146 – Unauthenticated Account Takeover – TYPO3 femanager Extension 8.0.0–8.4.1

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Summary

CVE-2026-77146 is a missing-authorization vulnerability (CWE-862) in the invitation controller of the femanager extension for TYPO3, affecting the 8.x release line (versions 8.0.0 through 8.4.1). The flaw allows an unauthenticated attacker to reset passwords and reactivate arbitrary frontend user accounts, resulting in full account takeover. The issue carries a high-severity CVSS score of 8.3.

Technical details

  • Root cause: The invitation controller in femanager does not properly halt request processing after issuing a redirect in response to invalid input (e.g., a missing/invalid invitation hash, or a request targeting a non-existent, disabled, or deleted user).
  • Trigger conditions: An attacker sends a crafted request to the invitation-handling endpoint with an invalid or manipulated hash/user reference; because execution continues past the redirect, the subsequent password-reset and account-reactivation logic still runs.
  • Attack vector: Network-based, requires no authentication and no user interaction, and has low attack complexity — the request can be sent directly to the exposed frontend endpoint.
  • Impact: An unauthenticated attacker can set a new password for and reactivate arbitrary frontend user accounts, leading to unauthorized account access and takeover (high integrity impact).

Affected software

  • Product: TYPO3 CMS extension "femanager" (Packagist package in2code/femanager)
  • Vulnerable version range: 8.0.0 up to and including 8.4.1
  • Note: femanager 6.4.4 and below, 7.0.0–7.5.4, and 13.0.0–13.3.5 were also patched in the same advisory for related but distinct authorization issues; CVE-2026-77146 specifically applies only to the 8.x line.

Severity

  • CVSS Score: 8.3 (High)
  • CVSS v4.0 Vector: AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade femanager to version 8.4.2 or later, which contains the fix for this issue.
  • If upgrading is not immediately possible: Restrict or disable public access to the femanager invitation controller/endpoint at the web server or reverse proxy layer, and monitor frontend user account logs for unexpected password resets or reactivations until the patch can be applied.

References

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