CVE-2026-57176: medium-severity vulnerability in python-social-auth social-core
social-auth-core Vulnerable to Account Takeover via Identity Binding Flaw in Vend Backend
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.8epss 0.2%
Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the Vend OAuth2 backend used only the numeric Vend user_id as the social-auth UID. When multiple Vend shops authenticate through the same application, users from different shops with the same internal Vend user ID could collide in the social-auth association table. A user from one shop could then be authenticated as the local account previously associated with the same numeric user ID from another shop. The issue affects applications using the Vend OAuth2 backend with more than one Vend shop. Version 5.0.0 patches the issue.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Affected products
python-social-auth · social-coreRelated CVEs — python-social-auth social-core
In the same product, most dangerous first.
CVE-2026-57175MEDIUMsocial-auth-core has an Improper Authentication issueEPSS 0.2%CVE-2026-57178HIGHsocial-auth-core: VK App backend accepts unsigned callback data when auth_key is missingEPSS 0.2%CVE-2026-57179MEDIUMsocial-auth-core has a Session Fixation issueEPSS 0.2%CVE-2026-115910MEDIUMPython Social Auth: OpenID Connect nonce is not bound to the browser session, so a stolen authorization code logs the attacker in as the victimEPSS 0.2%CVE-2026-62322MEDIUMPython Social Auth: Login CSRF in LINE backend (LineOAuth2) — missing OAuth state validation (incomplete fix of 5.0.0 campaign)EPSS 0.2%CVE-2026-57177MEDIUMsocial-auth-core has Login CSRF via Missing State Parameter in LoginRadius BackendEPSS 0.1%