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CVE-2026-92821— Sssd: sssd: access control bypass via premature ldap access rule evaluation

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SSSD 中发现了一个漏洞。当 SSSD 配置为在 LDAP（轻量级目录访问协议）环境中，于评估限制性访问规则之前先检查密码过期警告时，密码过期警告会提前终止规则评估，并将该访问请求视为成功。拥有已过期密码但使用替代认证方法（例如 SSH 公钥认证）的远程认证用户可利用此漏洞，绕过访问控制限制，从而获得对受保护系统的未授权访问权限。

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-92821

Vulnerability Information
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Vulnerability Title
Sssd: sssd: access control bypass via premature ldap access rule evaluation
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in SSSD. When configured to evaluate password expiration warnings before restrictive access rules in LDAP (Lightweight Directory Access Protocol) environments, an expired-password warning terminates rule evaluation early and treats the access request as successful. A remote authenticated user with an expired password using an alternative authentication method, such as SSH public key authentication, can exploit this flaw to bypass access control restrictions and gain unauthorized access to protected systems.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
返回错误的状态编码
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-92821

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III. Intelligence Information for CVE-2026-92821

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Vendor Advisories for CVE-2026-92821 (2)

Same Patch Batch · Red Hat · 2026-10-06 · 16 CVEs total

CVE-2026-104044 6.2 MEDIUM Sssd: sssd: denial of service via crafted passkey kerberos authentication request
CVE-2026-104038 5.9 MEDIUM Sssd: sssd: denial of service via missing sid extension in certificate mapping
CVE-2026-104036 5.8 MEDIUM Sssd: sssd: denial of service via out-of-bounds write in nfs idmap plugin
CVE-2026-104043 5.5 MEDIUM Sssd: sssd: denial of service via undersized packet parsing in nss responder
CVE-2026-104042 5.5 MEDIUM Sssd: sssd: denial of service via out-of-bounds read in pam responder
CVE-2026-104041 5.5 MEDIUM Sssd: sssd: denial of service via unbounded negative cache growth
CVE-2026-104037 5.5 MEDIUM Sssd: sssd: denial of service via packet length underflow in autofs responder
CVE-2026-104035 5.5 MEDIUM Sssd: sssd: denial of service via memory exhaustion in kcm responder
CVE-2026-104032 5.5 MEDIUM Sssd: sssd: denial of service via unprivileged autofs cache invalidation
CVE-2026-104031 5.5 MEDIUM Sssd: sssd: denial of service via memory exhaustion in autofs responder
CVE-2026-105305 5.4 MEDIUM Keycloak-services: keycloak-services: device authorization grant bypasses per-client minim
CVE-2026-104033 5.4 MEDIUM Sssd: sssd: access control bypass via improper ldap shadow expiration check
CVE-2026-104039 4.7 MEDIUM Sssd: sssd: denial of service via stale connection state reuse in pam gssapi responder
CVE-2026-104034 4.7 MEDIUM Sssd: sssd: denial of service via use-after-free in kcm ticket renewal
CVE-2026-104040 4.4 MEDIUM Sssd: sssd: information disclosure via odata injection in entra id lookups

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-393

V. Comments for CVE-2026-92821

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