CVE-2021-21320

    Dashboard / Vulnerabilities / CVE-2021-21320

    CVE-2021-21320

    Published: 2 Mar 2021Last Modified: 9 Jul 2026

    Summary:

    Details: matrix-react-sdk is an npm package which is a Matrix SDK for React Javascript. In matrix-react-sdk before version 3.15.0, the user content sandbox can be abused to trick users into opening unexpected documents. The content is opened with a `blob` origin that cannot access Matrix user data, so messages and secrets are not at risk. This has been fixed in version 3.15.0.

    References: https://github.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-52mq-6jcv-j79x, https://www.npmjs.com/package/matrix-react-sdk, https://github.com/matrix-org/matrix-react-sdk/commit/b386f0c73b95ecbb6ea7f8f79c6ff5171a8dedd1, https://github.com/matrix-org/matrix-react-sdk/pull/5657

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -9ab92e7971ae830fe77cc12a0a249ee8794f456c

    Affected versions

    v3.15.0-rc.1

    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-2021-21320 | CVE-DB