HSEC-2023-0002

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    HSEC-2023-0002

    Published: 14 Nov 2025Last Modified: 4 Feb 2026

    Summary: Improper Verification of Cryptographic Signature

    Details: # Improper Verification of Cryptographic Signature The Biscuit specification version 1 contains a vulnerable algorithm that allows malicious actors to forge valid Γ-signatures. Such an attack would allow an attacker to create a token with any access level. The version 2 of the specification mandates a different algorithm than gamma signatures and as such is not affected by this vulnerability.

    References: https://eprint.iacr.org/2020/1484, https://github.com/biscuit-auth/biscuit/security/advisories/GHSA-75rw-34q6-72cr

    Affected packages

    Package

    Name: biscuit-haskell

    Purl: pkg:hackage/biscuit-haskell

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0.1.0.0
    Fixed -0.2.0.0

    Affected versions

    0.1.0.0
    0.1.1.0

    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
    HSEC-2023-0002 | CVE-DB