CVE-2026-46715: Auth Bypass

Description

Flask-Security-Too allows users to add security features to their Flask applicationa. Version 5.8.0's OAuth reauthentication flow can mark a session as fresh after verifying an OAuth account that belongs to a different user. If an attacker can operate an already-authenticated but stale victim session, they can complete OAuth verification using their own OAuth identity. The victim session is then treated as recently reauthenticated, allowing freshness-protected account actions to proceed. Version 5.8.1 contains a fix for this issue.

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Weakness Type (CWE)

CWE-287 Improper Authentication

References

Other References

https://github.com/pallets-eco/flask-security/commit/8e69f3a94a463c0e8ddc46e31743717559fd8d48 https://github.com/pallets-eco/flask-security/security/advisories/GHSA-97r5-pg8x-p63p https://github.com/pallets-eco/flask-security/security/advisories/GHSA-97r5-pg8x-p63p

Frequently Asked Questions

What is CVE-2026-46715? +

Flask-Security-Too allows users to add security features to their Flask applicationa. Version 5.8.0's OAuth reauthentication flow can mark a session as fresh after verifying an OAuth account that belongs to a different user. If an attacker can operate an already-authenticated but stale victim session, they can complete OAuth verification using their own OAuth identity. The victim session is then treated as recently reauthenticated, allowing freshness-protected account actions to proceed. Version 5.8.1 contains a fix for this issue.

How do I check if I'm vulnerable to CVE-2026-46715? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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