Auth bypass in Miguelgrinberg Flask-httpauth

CVE-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…

Vulnerability class: Broken Authentication

EPSS: 0.000 (7.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-34531?
CVE-2026-34531 is a medium-severity vulnerability in Miguelgrinberg Flask-httpauth, classified under Improper Authentication. CVSS score: 6.5/10. Published 2026-04-01.
How severe is CVE-2026-34531?
Medium severity. CVSS v3 base score is 6.5 out of 10.