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CVE-2026-57178— social-auth-core: VK App backend accepts unsigned callback data when auth_key is missing

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 是一个社交身份认证/注册机制。在 5.0.0 版本之前， 后端在处理 VK 应用程序的回调数据时，若未提供 参数，则不会验证回调数据的签名。使用此后端的應用可能會將攻擊者控制的、未签名的数据视为已验证的 VK 身份。攻击者可以操控回调字段（如 、 、 和 ），从而可能以任意 VK 用户 ID 进行身份认证。该问题仅影响使用了 后端的應用。此漏洞已在 5.0.0 版本中修复，修复方式为：在信任回调数据之前，必须要求 参数存在且有效。

CVSS 7.4 · High EPSS 0.16% · P5
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I. Basic Information for CVE-2026-57178

Vulnerability Information
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Vulnerability Title
social-auth-core: VK App backend accepts unsigned callback data when auth_key is missing
Source: CVE Program / CVE List V5
Vulnerability Description
Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the `vk-app` backend accepted VK application callback data without verifying the callback signature when the `auth_key` parameter was omitted. Applications using this backend could treat unsigned attacker-controlled data as a verified VK identity. An attacker could choose callback fields such as `viewer_id`, `access_token`, `api_id`, and `api_result`, potentially allowing authentication as an arbitrary VK user ID. The issue affects only applications using the `vk-app` backend. The issue has been fixed in version 5.0.0 by requiring `auth_key` to be present and valid before callback data is trusted.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
python-social-auth social-core < 5.0.0 -

II. Public POCs for CVE-2026-57178

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III. Intelligence Information for CVE-2026-57178

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Vendor Advisories for CVE-2026-57178 (1)

Same Patch Batch · python-social-auth · 2026-09-24 · 5 CVEs total

CVE-2026-57176 6.8 MEDIUM social-auth-core Vulnerable to Account Takeover via Identity Binding Flaw in Vend Backend
CVE-2026-57175 6.4 MEDIUM social-auth-core has an Improper Authentication issue
CVE-2026-57177 4.3 MEDIUM social-auth-core has Login CSRF via Missing State Parameter in LoginRadius Backend
CVE-2026-57179 4.2 MEDIUM social-auth-core has a Session Fixation issue

IV. Related Vulnerabilities

Same product: social-core
Same vendor: python-social-auth
Same weakness: CWE-287

V. Comments for CVE-2026-57178

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