Flask-Security-Too OAuth reauthentication freshness bypass via cross- user OAuth identity acceptance

Summary Flask-Security-Too 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...

PYSEC-2026-2478 Flask-Security-Too OAuth reauthentication freshness bypass via cross- user OAuth identity acceptance

Summary Flask-Security-Too 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...

PT-2026-59145

Summary Flask-Security-Too 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...

Flask-Security-Too: WebAuthn reauthentication freshness bypass via cross-user assertion

Summary Flask-Security-Too 5.8.0 and 5.8.1 mark a session as reauthentication-fresh after processing a WebAuthn assertion whose proven credential belongs to a different user than the currently authenticated session user. The check that GHSA-97r5-pg8x-p63p added on the OAuth reauthentication path...

GHSA-F66Q-9RF6-8795 Flask-Security-Too: WebAuthn reauthentication freshness bypass via cross-user assertion

Summary Flask-Security-Too 5.8.0 and 5.8.1 mark a session as reauthentication-fresh after processing a WebAuthn assertion whose proven credential belongs to a different user than the currently authenticated session user. The check that GHSA-97r5-pg8x-p63p added on the OAuth reauthentication path...

PYSEC-2026-809 Flask-Security vulnerable to Open Redirect

This affects all versions of package Flask-Security. When using the getpostlogoutredirect and getpostloginredirect functions, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\evil.com/path. This vulnerability is only...

Flask-Security vulnerable to Open Redirect

This affects all versions of package Flask-Security. When using the getpostlogoutredirect and getpostloginredirect functions, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\evil.com/path. This vulnerability is only...

Flask-Security-Too: WebAuthn reauthentication freshness bypass via cross-user assertion

Flask-Security-Too 5.8.0 and 5.8.1 mark a session as reauthentication-fresh after processing a WebAuthn assertion whose proven credential belongs to a different user than the currently authenticated session user. The check that GHSA-97r5-pg8x-p63p added on the OAuth reauthentication path user.ema...

PT-2026-60911

Summary Flask-Security-Too 5.8.0 and 5.8.1 mark a session as reauthentication-fresh after processing a WebAuthn assertion whose proven credential belongs to a different user than the currently authenticated session user. The check that GHSA-97r5-pg8x-p63p added on the OAuth reauthentication path...

Open Redirect

Overview Flask-Security is a Simple security for Flask apps. Affected versions of this package are vulnerable to Open Redirect via the validateredirecturl function. An attacker can redirect users to an attacker-controlled domain by crafting a specially formatted URL containing a backslash in the...

Flask-Security has an Open Redirect issue

Open Redirect in Flask-Security Summary flasksecurity.utils.validateredirecturl can allow an attacker-controlled redirect URL when subdomain redirects are enabled. The bypass uses a backslash inside the URL authority/host: text http://evil.com.whitelist.com http://evil.com%5C.whitelist.com...

GHSA-W2J7-F3C6-G8CW Flask-Security has an Open Redirect issue

Open Redirect in Flask-Security Summary flasksecurity.utils.validateredirecturl can allow an attacker-controlled redirect URL when subdomain redirects are enabled. The bypass uses a backslash inside the URL authority/host: text http://evil.com.whitelist.com http://evil.com%5C.whitelist.com...

Flask-Security has an Open Redirect issue

flasksecurity.utils.validateredirecturl can allow an attacker-controlled redirect URL when subdomain redirects are enabled. The bypass uses a backslash inside the URL authority/host: text http://evil.com.whitelist.com http://evil.com%5C.whitelist.com Python's urlsplit parses the full authority as...

CVE-2026-42489

The Xen hypervisor is vulnerable to a domctl lock open to abuse issue (CVE-2026-42489 ). When creating or managing guests, domctl operations utilize a system-wide lock to prevent parallel execution; however, the lock acquisition mechanism does not provide fairness . This flaw could lead to denial...

CVE-2026-42490

This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE. To create and manage guests, domctl operations are used by the control domain, a possible Xenstore domain, or by a domain controlling a particular guest. Some of these...

GHSA-97R5-PG8X-P63P Flask-Security-Too OAuth reauthentication freshness bypass via cross- user OAuth identity acceptance

Summary Flask-Security-Too 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...

Always-Incorrect Control Flow Implementation

Overview Affected versions of this package are vulnerable to Always-Incorrect Control Flow Implementation in the OAuth reauthentication for stale sessions. An attacker can perform unauthorized account actions by completing OAuth verification with their own identity in a stale, authenticated victi...

Always-Incorrect Control Flow Implementation

Overview Flask-Security is a Simple security for Flask apps. Affected versions of this package are vulnerable to Always-Incorrect Control Flow Implementation in the OAuth reauthentication for stale sessions. An attacker can perform unauthorized account actions by completing OAuth verification wit...

Flask-Security-Too OAuth reauthentication freshness bypass via cross- user OAuth identity acceptance

Flask-Security-Too 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...

PT-2026-42857

Name of the Vulnerable Software and Affected Versions Flask-Security-Too version 5.8.0 Description An issue in the OAuth reauthentication flow allows a session to be marked as fresh after verifying an OAuth account that belongs to a different user. If an attacker controls an already-authenticated...