Bug 2540598 (CVE-2026-57176)

Summary: CVE-2026-57176 social-auth-core: social-auth-core: Account takeover via Vend user ID collision
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dschmidt, jlanda, jmitchel, jwong, kshier, omaciel, simaishi, stcannon, ttakamiy, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in social-auth-core. An identity binding weakness in the Vend OAuth2 authentication backend allows an authenticated remote attacker to gain unauthorized access to another user's account. Because the backend relies solely on numeric user identifiers without scoping them to specific shops, users from different shops sharing identical numeric identifiers can collide in the account association table. An attacker authenticating from one shop can thereby log in to an existing local account associated with another user.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-24 17:32:25 UTC 
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.