Cross-site scripting in Wiki.js - CVE-2021-43856

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Main Vulnerability Database Vulnerabilities #VU128257

Cross-site scripting in Wiki.js - CVE-2021-43856

Published: December 26, 2021 / Updated: April 28, 2026


Vulnerability identifier: #VU128257
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-43856
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Wiki.js
Software vendor:
Requarks.io

Description

The vulnerability allows a remote user to execute arbitrary JavaScript in another user's browser.

The vulnerability exists due to stored cross-site scripting in non-image file uploads when viewing uploaded files inline in the browser. A remote user can upload a specially crafted file to execute arbitrary JavaScript in another user's browser.

The malicious file must be opened directly by the victim and does not trigger from a normal Wiki.js page.


Remediation

Install security update from vendor's website.

External links