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Findings

CVE-2026-34531

Flask-HTTPAuth provides Basic, Digest and Token HTTP authentication for Flask routes.

Published Apr 1, 2026 · updated Jun 17, 2026 · miguelgrinberg flask-httpauth

Flask-HTTPAuth provides Basic, Digest and Token HTTP authentication for Flask routes. Prior to version 4.8.1, in a situation where the client makes a request to a token protected resource without passing a token, or passing an empty token, Flask-HTTPAuth would invoke the application's token verification callback function with the token argument set to an empty string. If the application had any users in its database with an empty string set as their token, then it could potentially authenticate the client request against any of those users. This issue has been patched in version 4.8.1.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 1, 2026 · NIST NVD

    Detected

    Flask-HTTPAuth provides Basic, Digest and Token HTTP authentication for Flask routes. Prior to version 4.8.1, in a situation where the client makes a request to a token protected resource without passing a token, or passing an empty token, Flask-HTTPAuth would invoke the application's token verification callback function with the token argument set to an empty string. If the application had any us

  2. Jun 17, 2026 · NIST NVD

    Updated

    Flask-HTTPAuth provides Basic, Digest and Token HTTP authentication for Flask routes. Prior to version 4.8.1, in a situation where the client makes a request to a token protected resource without passing a token, or passing an empty token, Flask-HTTPAuth would invoke the application's token verification callback function with the token argument set to an empty string. If the application had any us

Affected

  • cpe miguelgrinberg/flask-httpauthversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-34531

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-34531

    Flask-HTTPAuth provides Basic, Digest and Token HTTP authentication for Flask routes. Prior to version 4.8.1, in a situation where the client makes a request to a token protected resource without passing a token, or passing an empty token, Flask-HTTPAuth would invoke the applicat

    nvd.nist.gov

References

CVE-2026-34531 · ZeroDay Findings