CVE-2021-39195

    Dashboard / Vulnerabilities / CVE-2021-39195

    CVE-2021-39195

    Published: 7 Sept 2021Last Modified: 7 Aug 2026

    Summary:

    Details: Misskey is an open source, decentralized microblogging platform. In affected versions a Server-Side Request Forgery vulnerability exists in "Upload from URL" and remote attachment handling. This could result in the disclosure of non-public information within the internal network. This has been fixed in 12.90.0. However, if you are using a proxy, you will need to take additional measures. As a workaround this exploit may be avoided by appropriately restricting access to private networks from the host where the application is running.

    References: https://github.com/misskey-dev/misskey/blob/develop/CHANGELOG.md#12900-20210904, https://github.com/misskey-dev/misskey/commit/e1a8b158e04ad567d92d8daf3cc0898ee18f1a2e, https://github.com/misskey-dev/misskey/security/advisories/GHSA-mqv7-gxh4-r5vf

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -4b48ba4e8cff670ce4726417fe9b176cda0c4e76

    Affected versions

    12.89.2
    12.89.1
    12.89.0

    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-2021-39195 | CVE-DB