{"id":"DEBIAN-CVE-2026-115910","details":"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.","modified":"2026-10-27T05:00:06.247246018Z","published":"2026-10-26T17:17:18.597Z","upstream":["CVE-2026-115910"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-115910"}],"affected":[{"package":{"name":"social-auth-core","ecosystem":"Debian:12","purl":"pkg:deb/debian/social-auth-core?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.0-1","4.4.2-1","4.4.2-2","4.5.3-1","4.5.4-1","4.5.6-1","4.6.1-1","4.8.1-1","4.8.3-1","4.8.5-1","4.8.7-1","4.9.1-1","5.0.2-1","5.1.0-1","5.1.0-2","5.1.1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115910.json"}},{"package":{"name":"social-auth-core","ecosystem":"Debian:13","purl":"pkg:deb/debian/social-auth-core?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-1","4.8.1-1","4.8.3-1","4.8.5-1","4.8.7-1","4.9.1-1","5.0.2-1","5.1.0-1","5.1.0-2","5.1.1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115910.json"}},{"package":{"name":"social-auth-core","ecosystem":"Debian:14","purl":"pkg:deb/debian/social-auth-core?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-1","4.8.1-1","4.8.3-1","4.8.5-1","4.8.7-1","4.9.1-1","5.0.2-1","5.1.0-1","5.1.0-2","5.1.1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115910.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"}]}