DEBIAN-CVE-2026-87853

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    DEBIAN-CVE-2026-87853

    Published: 9 Sept 2026Last Modified: 11 Sept 2026
    Upstream:
    CVE-2026-87853

    Summary:

    Details: 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.

    References: https://security-tracker.debian.org/tracker/CVE-2026-87853

    Affected packages

    Package

    Name: sssd

    Purl: pkg:deb/debian/sssd?arch=source&distro=bookworm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.10.1-1
    2.10.1-2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    DEBIAN-CVE-2026-87853 | CVE-DB