Improper Authentication Affecting flask-httpauth package, versions [,4.8.1)
Threat Intelligence
This vulnerability is trending on Twitter; this may indicate a growing threat.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Improper Authentication vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-PYTHON-FLASKHTTPAUTH-15922817
- published7 Apr 2026
- disclosed31 Mar 2026
- creditnpbhatter17
Introduced: 31 Mar 2026
CVE-2026-34531 (opens in a new tab)How to fix?
Upgrade Flask-HTTPAuth to version 4.8.1 or higher.
Overview
Flask-HTTPAuth is a HTTP authentication for Flask routes
Affected versions of this package are vulnerable to Improper Authentication in the token verification process. An attacker can gain unauthorized access by submitting a request with a missing or empty token if the application stores empty strings as valid user tokens. This is only exploitable if the application verifies tokens by searching for them in a user database and stores empty strings as user tokens instead of NULL values.
Workaround
This vulnerability can be mitigated by ensuring that no user in the user database has their token set to an empty string; set such tokens to NULL instead.