Python Social Auth is a social authentication and registration mechanism. Prior to 6.2.0, OpenIdConnectAuth in social_core/backends/open_id_connect.py uses get_and_store_nonce to place the OpenID Connect nonce in a shared OpenIdConnectAssociation table, and get_nonce and validate_claims verify only that the nonce exists and has not expired rather than binding it to the browser session and OAuth state that initiated the login. An attacker who obtains a victim's unused authorization code can start a separate login to obtain valid state for the attacker's browser, submit the victim's code with that state, and pass nonce validation because the victim nonce is globally available. With DEFAULT_USE_PKCE disabled in the default OpenIdConnectAuth configuration, the attacker can be logged in as the victim. This issue is fixed in version 6.2.0.
History

Sat, 31 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 27 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-303
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 26 Oct 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Python-social-auth
Python-social-auth social-core
Vendors & Products Python-social-auth
Python-social-auth social-core

Mon, 26 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
Description Python Social Auth is a social authentication and registration mechanism. Prior to 6.2.0, OpenIdConnectAuth in social_core/backends/open_id_connect.py uses get_and_store_nonce to place the OpenID Connect nonce in a shared OpenIdConnectAssociation table, and get_nonce and validate_claims verify only that the nonce exists and has not expired rather than binding it to the browser session and OAuth state that initiated the login. An attacker who obtains a victim's unused authorization code can start a separate login to obtain valid state for the attacker's browser, submit the victim's code with that state, and pass nonce validation because the victim nonce is globally available. With DEFAULT_USE_PKCE disabled in the default OpenIdConnectAuth configuration, the attacker can be logged in as the victim. This issue is fixed in version 6.2.0.
Title Python Social Auth: OpenID Connect nonce is not bound to the browser session, so a stolen authorization code logs the attacker in as the victim
Weaknesses CWE-345
CWE-384
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-26T16:44:34.337Z

Updated: 2026-10-31T01:34:08.259Z

Reserved: 2026-10-23T20:21:45.106Z

Link: CVE-2026-115910

cve-icon Vulnrichment

Updated: 2026-10-31T01:34:00.468Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-26T17:17:18.597

Modified: 2026-10-31T02:17:29.397

Link: CVE-2026-115910

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-26T16:44:34Z

Links: CVE-2026-115910 - Bugzilla