CVE-2021-43855: high-severity vulnerability in Requarks wiki
Stored XSS via SVG in Requarks/wiki
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.2epss 0.9%
Wiki.js is a wiki app built on node.js. Wiki.js 2.5.263 and earlier is vulnerable to stored cross-site scripting through a SVG file upload made via a custom request with a fake MIME type. 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. The malicious SVG can only be uploaded by crafting a custom request to the server with a fake MIME type. A patch in version 2.5.264 fixes this vulnerability by adding an additional file extension verification check to the 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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-2021-43856HIGHStored XSS in non-image uploads in Requarks/wikiEPSS 0.9%CVE-2021-43842MEDIUMStored XSS via SVG file upload in Wiki.jsEPSS 0.7%CVE-2022-23654HIGHImproper write access check in Requarks/wikiEPSS 0.7%