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CVE-2026-46715— Flask-Security-Too OAuth reauthentication freshness bypass via cross- user OAuth identity acceptance

Quick assessment

Affected
pallets-eco Flask-Security-Too
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pallets Ecosystem Flask-Security是Pallets Ecosystem团队的一个为Flask应用添加安全功能的扩展库。 Pallets Ecosystem Flask-Security 5.8.0版本及之前版本存在授权问题漏洞，该漏洞源于OAuth重新身份验证流程在验证属于不同用户的OAuth账户时将会话标记为新鲜，可能导致攻击者操作已通过身份验证但过期的受害者会话后，使用自身OAuth身份完成验证，进而将受害者会话视为最近重新认证，允许执行受新鲜度保护的账户操作。

AI Predicted 8.1 Difficulty: Easy EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
pallets-eco Flask-Security-Too >= 5.8.0, < 5.8.1 affected
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I. Basic Information for CVE-2026-46715

Vulnerability Information
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Vulnerability Title
Flask-Security-Too OAuth reauthentication freshness bypass via cross- user OAuth identity acceptance
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Pallets Ecosystem Flask-Security 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pallets Ecosystem Flask-Security是Pallets Ecosystem团队的一个为Flask应用添加安全功能的扩展库。 Pallets Ecosystem Flask-Security 5.8.0版本及之前版本存在授权问题漏洞，该漏洞源于OAuth重新身份验证流程在验证属于不同用户的OAuth账户时将会话标记为新鲜，可能导致攻击者操作已通过身份验证但过期的受害者会话后，使用自身OAuth身份完成验证，进而将受害者会话视为最近重新认证，允许执行受新鲜度保护的账户操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pallets-eco Flask-Security-Too >= 5.8.0, < 5.8.1 -

II. Public POCs for CVE-2026-46715

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-46715

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Patches & Fixes for CVE-2026-46715 (1)

Vendor Advisories for CVE-2026-46715 (1)

IV. Related Vulnerabilities

Same product: Flask-Security-Too
Same weakness: CWE-287

V. Comments for CVE-2026-46715

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