GHSA-w7fj-336r-vw49

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    GHSA-w7fj-336r-vw49

    Published: 1 Dec 2021Last Modified: 4 May 2026

    Summary: Cross-Site Scripting vulnerability in @backstage/plugin-auth-backend

    Details: ### Impact This vulnerability allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user's browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. ### Patches This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`. ### For more information If you have any questions or comments about this advisory: * Open an issue in the [Backstage repository](https://github.com/backstage/backstage) * Visit our chat, linked to in [Backstage README](https://github.com/backstage/backstage)

    References: https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49, https://nvd.nist.gov/vuln/detail/CVE-2021-43776, https://github.com/backstage/backstage, https://github.com/backstage/backstage/tree/master/plugins/auth-backend

    Affected packages

    Package

    Name: @backstage/plugin-auth-backend

    Purl: pkg:npm/%40backstage/plugin-auth-backend

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -0.4.9

    Affected versions

    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
    GHSA-w7fj-336r-vw49 | CVE-DB