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TI-2021-19661 Aliases CVE-2021-43855

Stored XSS via SVG in Requarks/wiki

Priority LOW 37CWE-79Published · Updated

Key facts

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

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

Summary

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.

Why it matters now

EPSS 0.00916 60th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed wiki (Requarks): 2.5.264

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
Requarkswikibefore 2.5.2642.5.264Patch availableCNA
  • wiki VendorRequarks Affected before 2.5.264 Fixed in 2.5.264 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:requarks:wiki.js:*:*:*:*:*:*:*:*before 2.5.264VulnerableRequarks
  • cpe:2.3:a:requarks:wiki.js:*:*:*:*:*:*:*:* Versions before 2.5.264 Vulnerable ·Requarks

Remediation

  • Fix · CNA wiki (Requarks) Fixed in 2.5.264

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43855

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