CVE-2026-46715: Pallets-Eco Flask-Security-Too

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Pallets-Eco Flask-Security-Too: from 5.8.0, before 5.8.1 (fixed in 5.8.1)

Published 2026-07-20. Last modified 2026-07-23.