{"id":"CVE-2026-87853","aliases":["ALSA-2026:77534","DEBIAN-CVE-2026-87853","EUVD-2026-75084","GHSA-993g-jgf7-rg3x","RHSA-2026:77534","RLSA-2026:77534","UBUNTU-CVE-2026-87853","openSUSE-SU-2026:11825-1"],"status":"published","title":"Sssd: sssd: idp authentication prefix comparison allows cross-user impersonation","description":"A flaw was found in SSSD's IdP authentication provider. The eval_access_token_buf() function compares the OIDC subject identifier using strncmp() with the authenticated user's identifier length, performing a prefix comparison instead of an exact match. An attacker whose IdP identifier is a strict prefix of a target user's identifier can authenticate as the target user.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00339,"percentile":0.27688,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-187"],"published":"2026-09-09T16:06:25Z","modified":"2026-11-11T12:58:51Z","fixes":[{"ecosystem":"AlmaLinux:10","package":"libipa_hbac","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"libsss_autofs","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"libsss_certmap","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"libsss_idmap","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"libsss_nss_idmap","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"libsss_nss_idmap-devel","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"libsss_sudo","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"python3-libipa_hbac","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"python3-libsss_nss_idmap","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"python3-sss","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"python3-sss-murmur","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"python3-sssdconfig","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-ad","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-client","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-common","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-common-pac","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-dbus","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-idp","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-ipa","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-kcm","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-krb5","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-krb5-common","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-ldap","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-nfs-idmap","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-passkey","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-proxy","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-tools","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"sssd-winbind-idmap","fixed_in":["2.12.0-3.el10_2.2"],"sources":["osv"]},{"ecosystem":"Red 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An attacker whose IdP identifier is a strict prefix of a target user's identifier can authenticate as the target user.","status":"published","published":"2026-09-09T18:32:05Z","modified":"2026-11-11T15:30:39Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-187"],"updated_at":"2026-11-11T15:34:47.187237Z"}],"nvd":[{"id":"CVE-2026-87853","description":"A flaw was found in SSSD's IdP authentication provider. The eval_access_token_buf() function compares the OIDC subject identifier using strncmp() with the authenticated user's identifier length, performing a prefix comparison instead of an exact match. An attacker whose IdP identifier is a strict prefix of a target user's identifier can authenticate as the target user.","status":"published","published":"2026-09-09T17:17:52.827Z","modified":"2026-11-11T13:17:32.137Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-187"],"updated_at":"2026-11-11T15:25:15.031694Z"}],"osv":[{"id":"DEBIAN-CVE-2026-87853","description":"A flaw was found in SSSD's IdP authentication provider. The eval_access_token_buf() function compares the OIDC subject identifier using strncmp() with the authenticated user's identifier length, performing a prefix comparison instead of an exact match. An attacker whose IdP identifier is a strict prefix of a target user's identifier can authenticate as the target user.","status":"published","published":"2026-09-09T17:17:52.827Z","modified":"2026-11-12T09:47:36.771457896Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-07T11:15:14.449016Z"},{"id":"RHSA-2026:77534","title":"Red Hat Security Advisory: sssd security update","status":"published","published":"2026-10-10T10:22:21Z","modified":"2026-10-10T10:35:28.892726163Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:23.547034Z"},{"id":"RLSA-2026:77534","title":"Moderate: sssd security update","description":"The System Security Services Daemon (SSSD) service provides a set of daemons to manage access to remote directories and authentication mechanisms. It also provides the Name Service Switch (NSS) and the Pluggable Authentication Modules (PAM) interfaces toward the system, and a pluggable back-end system to connect to multiple different account sources.\n\nSecurity Fix(es):\n\n* sssd: sssd: IdP authentication prefix comparison allows cross-user impersonation (CVE-2026-87853)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-10-09T12:10:46.463075Z","modified":"2026-10-09T12:45:02.55295435Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.449929Z"},{"id":"UBUNTU-CVE-2026-87853","description":"A flaw was found in SSSD's IdP authentication provider. The eval_access_token_buf() function compares the OIDC subject identifier using strncmp() with the authenticated user's identifier length, performing a prefix comparison instead of an exact match. An attacker whose IdP identifier is a strict prefix of a target user's identifier can authenticate as the target user.","status":"published","published":"2026-09-09T17:17:00Z","modified":"2026-10-17T13:01:14.958006887Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:24.828975Z"},{"id":"ALSA-2026:77534","title":"Moderate: sssd security update","description":"The System Security Services Daemon (SSSD) service provides a set of daemons to manage access to remote directories and authentication mechanisms. It also provides the Name Service Switch (NSS) and the Pluggable Authentication Modules (PAM) interfaces toward the system, and a pluggable back-end system to connect to multiple different account sources.  \n\nSecurity Fix(es):  \n\n  * sssd: sssd: IdP authentication prefix comparison allows cross-user impersonation (CVE-2026-87853)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-10-07T00:00:00Z","modified":"2026-10-29T11:30:22.716926797Z","updated_at":"2026-11-02T15:27:55.200553Z"},{"id":"openSUSE-SU-2026:11825-1","title":"libipa_hbac-devel-2.13.1-3.1 on GA media","description":"These are all security issues fixed in the libipa_hbac-devel-2.13.1-3.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-19T00:00:00Z","modified":"2026-09-20T16:15:03.273019746Z","updated_at":"2026-11-02T16:58:39.516824Z"}]}}