CVE-2021-43842

    Dashboard / Vulnerabilities / CVE-2021-43842

    CVE-2021-43842

    Published: 20 Dec 2021Last Modified: 8 Jul 2026

    Summary:

    Details: Wiki.js is a wiki app built on Node.js. Wiki.js versions 2.5.257 and earlier are vulnerable to stored cross-site scripting through a SVG file upload. By creating a crafted SVG file, a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the SVG is viewed directly by other users. Scripts do not execute when loaded inside a page via normal `<img>` tags. Commit 5d3e81496fba1f0fbd64eeb855f30f69a9040718 fixes this vulnerability by adding an optional (enabled by default) SVG sanitization step to all file uploads that match the SVG mime type. As a workaround, disable file upload for all non-trusted users. Wiki.js version 2.5.260 is the first production version to contain a patch. Version 2.5.258 is the first development build to contain a patch and is available only as a Docker image as requarks/wiki:canary-2.5.258.

    References: https://github.com/Requarks/wiki/releases/tag/2.5.260, https://github.com/Requarks/wiki/commit/5d3e81496fba1f0fbd64eeb855f30f69a9040718, https://github.com/Requarks/wiki/security/advisories/GHSA-3qv4-gp35-rgh7

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -5d3e81496fba1f0fbd64eeb855f30f69a9040718

    Affected versions

    2.5.255
    2.5.254
    2.5.219
    2.5.214
    2.5.201
    2.5.197
    2.5.191
    2.5.170
    2.5.159
    2.5.144
    2.5.136
    2.5.132
    2.5.126
    2.5.121
    2.5.117
    2.5.105

    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-2021-43842 | CVE-DB