Read the docs
TI-2021-04482 Aliases CVE-2021-21383

XSS in Wiki.js

Priority LOW 35CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

Wiki.js an open-source wiki app built on Node.js. Wiki.js before version 2.5.191 is vulnerable to stored cross-site scripting through mustache expressions in code blocks. This vulnerability exists due to mustache expressions being parsed by Vue during content injection even though it is contained within a `<pre>` element. By creating a crafted wiki page, a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the page is viewed by other users. For an example see referenced GitHub Security Advisory. Commit 5ffa189383dd716f12b56b8cae2ba0d075996cf1 fixes this vulnerability by adding the v-pre directive to all `<pre>` tags during the render.

Why it matters now

EPSS 0.00971 62nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed wiki (Requarks): 2.5.191

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Requarkswikibefore 2.5.1912.5.191Patch availableCNA
  • wiki VendorRequarks Affected before 2.5.191 Fixed in 2.5.191 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:requarks:wiki.js:*:*:*:*:*:*:*:*before 2.5.191VulnerableRequarks
  • cpe:2.3:a:requarks:wiki.js:*:*:*:*:*:*:*:* Versions before 2.5.191 Vulnerable ·Requarks

Remediation

  • Fix · CNA wiki (Requarks) Fixed in 2.5.191

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-21383

References

Exploit 1

Patch 1

Advisory 1

  • TI-2026-32203 Wiki.js: Privilege Escalation via Missing Group Validation in users.update CVSS 4.0HIGH 8.6
  • TI-2021-07999 Requarks wiki.js - Stored Cross-Site Scripting (XSS) in markdown editor CVSS 3.1MEDIUM 5.4
  • TI-2025-35387 Requarks Wiki.js 2.5.307 does not properly revoke or invalidate active JWT tokens when a… CVSS 3.1CRITICAL 9.1
  • TI-2020-12008 Directory Traversal in Wiki.js CVSS 3.1HIGH 8.6
  • TI-2022-07706 Improper write access check in Requarks/wiki CVSS 3.1HIGH 8.1
  • TI-2021-19662 Stored XSS in non-image uploads in Requarks/wiki CVSS 3.1HIGH 8.2
See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences