CVE-2026-57176

MEDIUM

6.8

CVSS v3

Description

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.

CWE-289

How to fix

Remediation Available

social-auth-coreDebian

Fixed in:5.0.2-1CVE-2026-57176

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Exploit Intelligence

0.22%probability of exploitation in 30 days

11thpercentile

Low risk: more likely to be exploited than 11% of all known CVEs.

References

Other references1

github.com

Related Vulnerabilities

Other CWE-289 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-56511	Critical	9.8	44%	-	Fix
CVE-2021-34746	Critical	9.8	18%	-	Fix
CVE-2017-16590	High	8.8	3.3%	-	-
CVE-2026-48618	Medium	6.5	3.2%	-	Fix
CVE-2025-55130	Critical	9.1	1.7%	-	Fix
CVE-2023-20046	High	8.8	0.9%	-	Fix

Common questions

How do I fix CVE-2026-57176?

Upgrade social-auth-core on debian unstable to 5.0.2-1 or later.

Is CVE-2026-57176 being actively exploited?

Not that we know of. CVE-2026-57176 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.22% is the estimated probability that it will be exploited in the next 30 days. That is higher than 11% of all scored CVEs.

How severe is CVE-2026-57176?

CVE-2026-57176 has a CVSS v3 base score of 6.8, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-57176 affect?

Published advisories record a fix for social-auth-core (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-29.