GHSA-2hfj-cxw7-g45p

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    GHSA-2hfj-cxw7-g45p

    Published: 14 Dec 2021Last Modified: 8 Jul 2026

    Summary: Unsafe inline XSS in pasting DOM element into chat

    Details: ### Impact Inline scripts are executed when Javascript is parsed via a paste action. 1. Open https://watch.owncast.online/ 2. Copy and then paste `<img src=null onerror=alert('hello')>` into the chat field. 3. An alert should pop up. ### Patches ``` ⋮ 13 │ // Content security policy ⋮ 14 │ csp := []string{ ⋮ 15 │ "script-src 'self' 'sha256-2HPCfJIJHnY0NrRDPTOdC7AOSJIcQyNxzUuut3TsYRY='", ⋮ 16 │ "worker-src 'self' blob:", // No single quotes around blob: ⋮ 17 │ } ``` Will be patched in 0.0.9 by blocking `unsafe-inline` Content Security Policy and specifying the `script-src`. The `worker-src` is required to be set to `blob` for the video player. ### For more information If you have any questions or comments about this advisory: * Open an issue in [owncast/owncast](https://github.com/owncast/owncast/issues) * Email us at [[email protected]](mailto:[email protected])

    References: https://github.com/owncast/owncast/security/advisories/GHSA-2hfj-cxw7-g45p, https://nvd.nist.gov/vuln/detail/CVE-2021-39183, https://github.com/owncast/owncast

    Affected packages

    Package

    Name: github.com/owncast/owncast

    Purl: pkg:golang/github.com/owncast/owncast

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -0.0.9

    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-2hfj-cxw7-g45p | CVE-DB