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    2 vulnerabilities by @fastify/auth

    CVE-2026-92087 (GCVE-0-2026-92087)

    Vulnerability from nvd – Published: 2026-09-16 14:21 – Updated: 2026-09-16 14:21
    VLAI
    Title
    @fastify/auth vulnerable to Authorization Bypass via order-dependent evaluation of composed auth
    Summary
    @fastify/auth is a Fastify plugin that composes multiple authentication and authorization strategies into a single route guard. In versions 5.0.0 through 5.1.0, when strategies are composed with the relation "or" option together with the run "all" option and one entry is a nested array acting as an AND group, the group is evaluated in an order-dependent way: an earlier failing check is silently dropped and the group's result becomes the outcome of its last check. As a result, a request that satisfies only the last member of an AND group, for example an attacker who holds a valid API key but is not an administrator, is authorized instead of rejected, and a related order-dependent bypass affects the mirror configuration where the top-level relation is "and" and a nested group uses "or". The issue is fixed in @fastify/auth 5.1.1, and users should upgrade to 5.1.1 or later. As a workaround, omit the run "all" option where it is not required, order each AND group so its stricter check is evaluated last, or replace nested AND groups with an explicit top-level "and" composition.
    Severity
    8.1 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    @fastify/auth @fastify/auth Affected: 5.0.0 , < 5.1.1 (semver)
    Unaffected: 5.1.1 (semver)
    		Create a notification for this product.
    Credits
    Sengtocxoen UlisesGascon mcollina
    Show details on NVD website
    To clipboard 

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    CVE-2026-92087 (GCVE-0-2026-92087)

    Vulnerability from cvelistv5 – Published: 2026-09-16 14:21 – Updated: 2026-09-16 14:21
    VLAI
    Title
    @fastify/auth vulnerable to Authorization Bypass via order-dependent evaluation of composed auth
    Summary
    @fastify/auth is a Fastify plugin that composes multiple authentication and authorization strategies into a single route guard. In versions 5.0.0 through 5.1.0, when strategies are composed with the relation "or" option together with the run "all" option and one entry is a nested array acting as an AND group, the group is evaluated in an order-dependent way: an earlier failing check is silently dropped and the group's result becomes the outcome of its last check. As a result, a request that satisfies only the last member of an AND group, for example an attacker who holds a valid API key but is not an administrator, is authorized instead of rejected, and a related order-dependent bypass affects the mirror configuration where the top-level relation is "and" and a nested group uses "or". The issue is fixed in @fastify/auth 5.1.1, and users should upgrade to 5.1.1 or later. As a workaround, omit the run "all" option where it is not required, order each AND group so its stricter check is evaluated last, or replace nested AND groups with an explicit top-level "and" composition.
    Severity
    8.1 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    @fastify/auth @fastify/auth Affected: 5.0.0 , < 5.1.1 (semver)
    Unaffected: 5.1.1 (semver)
    		Create a notification for this product.
    Credits
    Sengtocxoen UlisesGascon mcollina
    Show details on NVD website
    To clipboard 

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