{"id":"UBUNTU-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":"2026-10-28T20:17:11.951241929Z","published":"2026-10-26T17:17:00Z","upstream":["CVE-2026-115910"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-115910"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-115910"},{"type":"REPORT","url":"https://github.com/python-social-auth/social-core/commit/c2f2ae4663bef19ee8b07f2cf5a2344f9155d826"},{"type":"REPORT","url":"https://github.com/python-social-auth/social-core/pull/2141"},{"type":"REPORT","url":"https://github.com/python-social-auth/social-core/security/advisories/ghsa-h2r5-x5m7-3935"},{"type":"REPORT","url":"https://security-tracker.debian.org/tracker/cve-2026-115910"},{"type":"REPORT","url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/115xxx/cve-2026-115910.json"},{"type":"REPORT","url":"https://github.com/python-social-auth/social-core/releases/tag/6.2.0"},{"type":"REPORT","url":"https://nvd.nist.gov/vuln/detail/cve-2026-115910"}],"affected":[{"package":{"name":"social-auth-core","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/social-auth-core?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.1.0-1","binary_name":"python3-social-auth-core"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115910.json"}},{"package":{"name":"social-auth-core","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/social-auth-core?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.0-1.1","4.1.0-1","4.2.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-social-auth-core","binary_version":"4.2.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115910.json"}},{"package":{"name":"social-auth-core","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/social-auth-core?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.2-2","4.5.3-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.5.3-1","binary_name":"python3-social-auth-core"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115910.json"}},{"package":{"name":"social-auth-core","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/social-auth-core?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.3-1","5.0.2-1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.0.2-1","binary_name":"python3-social-auth-core"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115910.json"}},{"package":{"name":"social-auth-core","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/social-auth-core?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-1","4.8.1-1","4.8.3-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.8.3-1","binary_name":"python3-social-auth-core"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}