CVE-2021-44878

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    CVE-2021-44878

    Published: 6 Jan 2022Last Modified: 9 Jul 2026

    Summary:

    Details: If an OpenID Connect provider supports the "none" algorithm (i.e., tokens with no signature), pac4j v5.3.0 (and prior) does not refuse it without an explicit configuration on its side or for the "idtoken" response type which is not secure and violates the OpenID Core Specification. The "none" algorithm does not require any signature verification when validating the ID tokens, which allows the attacker to bypass the token validation by injecting a malformed ID token using "none" as the value of "alg" key in the header with an empty signature value.

    References: https://openid.net/specs/openid-connect-core-1_0.html#IDToken, https://www.pac4j.org/blog/cve_2021_44878_is_this_serious.html, https://github.com/pac4j/pac4j/commit/22b82ffd702a132d9f09da60362fc6264fc281ae

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -a1ae387ce42b09ffa114065f8782061404be4cf4

    Affected versions

    pac4j-parent-5.3.0

    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
    CVE-2021-44878 | CVE-DB