CVE-2021-43842: medium-severity vulnerability in Requarks wiki
Stored XSS via SVG file upload in Wiki.js
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.4epss 0.7%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Affected products
Requarks · wikiRelated CVEs — Requarks wiki
In the same product, most dangerous first.
CVE-2021-43800HIGHAsset directory traversal with some storage modules on WindowsEPSS 1.8%CVE-2020-15236HIGHDirectory Traversal in Wiki.jsEPSS 1.8%CVE-2021-21383HIGHXSS in Wiki.jsEPSS 1.0%CVE-2021-43855HIGHStored XSS via SVG in Requarks/wikiEPSS 0.9%CVE-2021-43856HIGHStored XSS in non-image uploads in Requarks/wikiEPSS 0.9%CVE-2022-23654HIGHImproper write access check in Requarks/wikiEPSS 0.7%