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CVE-2026-62322— Python Social Auth: Login CSRF in LINE backend (LineOAuth2) — missing OAuth state validation (incomplete fix of 5.0.0 campaign)

Quick assessment

Affected
python-social-auth social-core
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.

Python Social Auth 是一种社交认证/注册机制。在 5.0.2 版本之前，LINE 后端在未验证返回的 OAuth 状态的情况下交换授权码。攻击者可以发起针对其控制的 LINE 账户的授权流程，并诱导受害者访问由此生成的回调 URL，从而导致应用程序将受害者登录到攻击者的账户中。当启用账户链接功能时，同样的缺失验证可将攻击者的 LINE 身份与受害者现有账户进行关联，从而创建一个持久的非授权登录路径。只有启用了 LINE 后端的受影响应用程序才会受到此漏洞的影响。该问题已在 5.0.2 版本中修复。

CVSS 6.5 · Medium EPSS 0.15% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
python-social-auth social-core < 5.0.2 affected
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I. Basic Information for CVE-2026-62322

Vulnerability Information
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Vulnerability Title
Python Social Auth: Login CSRF in LINE backend (LineOAuth2) — missing OAuth state validation (incomplete fix of 5.0.0 campaign)
Source: CVE Program / CVE List V5
Vulnerability Description
Python Social Auth is a social authentication/registration mechanism. Prior to 5.0.2, the LINE backend exchanges an authorization code without validating the returned OAuth state. An attacker can begin authorization for an attacker-controlled LINE account and induce a victim to visit the resulting callback URL, causing the application to log the victim into the attacker's account. When account linking is enabled, the same missing validation can link the attacker's LINE identity to the victim's existing account and create a persistent unauthorized login path. Only applications with the LINE backend enabled are affected. This issue is fixed in version 5.0.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
python-social-auth social-core < 5.0.2 -

II. Public POCs for CVE-2026-62322

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III. Intelligence Information for CVE-2026-62322

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Patches & Fixes for CVE-2026-62322 (2)

Vendor Advisories for CVE-2026-62322 (1)

Vendor Pages for CVE-2026-62322 (1)

IV. Related Vulnerabilities

Same product: social-core
Same vendor: python-social-auth
Same weakness: CWE-352

V. Comments for CVE-2026-62322

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