Vulnerability · Published Dec 27, 2021 · Assigned by GitHub_M
CVE-2021-43856Stored XSS in non-image uploads in Requarks/wiki
High 8.2
In plain English
A high-severity cross-site scripting in wiki from Requarks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).
Official description
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 non-image file uploads for file types that can be viewed directly inline in the browser. By creating a malicious file which can execute inline JS when viewed in the browser (e.g. XML files), a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the file is viewed directly by other users. The file must be opened directly by the user and will not trigger directly in a normal Wiki.js page. A patch in version 2.5.264 fixes this vulnerability by adding an optional (enabled by default) force download flag to all non-image file types, preventing the file from being viewed inline in the browser. As a workaround, disable file upload for all non-trusted users. --- Thanks to @Haxatron for reporting this vulnerability. Initially reported via https://huntr.dev/bounties/266bff09-00d9-43ca-a4bb-bb540642811f/
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
References
- https://github.com/Requarks/wiki/security/advisories/GHSA-rhpf-929m-7fm2 x_refsource_CONFIRM
- https://github.com/Requarks/wiki/commit/79bdd4409316adf649806de3e22352297f85cee0 x_refsource_MISC
- https://github.com/Requarks/wiki/releases/tag/2.5.264 x_refsource_MISC