CVE-2026-57178

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Source
https://cve.org/CVERecord?id=CVE-2026-57178
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57178.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-57178
Aliases
Downstream
Published
2026-09-24T17:25:47Z
Modified
2026-09-25T03:48:33Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
social-auth-core: VK App backend accepts unsigned callback data when auth_key is missing
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-287",
        "CWE-347"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57178.json"
}
References

Affected packages

Git / github.com/python-social-auth/social-core

Affected ranges

Type
GIT
Repo
https://github.com/python-social-auth/social-core
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
29dffe68c7c23f3d5cb5e051e7cb40447ffb55d5
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "5.0.0"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

0.*
0.0.1
0.1.0
0.2.0
0.2.1
1.*
1.0.1
1.1.0
1.2.0
1.3.0
1.4.0
1.5.0
1.6.0
1.7.0
2.*
2.0.0
3.*
3.0.0
3.1.0
3.2.0
3.3.0
3.3.1
3.3.2
3.3.3
3.4.0
4.*
4.0.0
4.0.1
4.0.2
4.0.3
4.1.0
4.2.0
4.3.0
4.4.0
4.4.1
4.4.2
4.5.0
4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.5.6
4.6.0
4.6.1
4.7.0
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57178.json"