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CVE-2021-43842

Stored XSS via SVG file upload in Wiki.js

MEDIUM
5.4
CVSS Score
Published: December 20, 2021 at 10:30 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
1 product affected across 1 vendorWiki.js

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.7%

Description

Wiki.js is a wiki app built on Node.js. Wiki.js versions 2.5.257 and earlier are vulnerable to stored cross-site scripting through a SVG file upload. 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. Commit 5d3e81496fba1f0fbd64eeb855f30f69a9040718 fixes this vulnerability by adding an 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. Wiki.js version 2.5.260 is the first production version to contain a patch. Version 2.5.258 is the first development build to contain a patch and is available only as a Docker image as requarks/wiki:canary-2.5.258.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Wiki.js· Requarks
95%
v ≤ 2.5.257v < 2.5.260
Affected range stops below 2.5.258, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.5.260, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/Requarks/wiki/commit/5d3e81496fba1f0fbd64eeb855f30f69a9040718
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/Requarks/wiki/releases/tag/2.5.260
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/Requarks/wiki/security/advisories/GHSA-3qv4-gp35-rgh7

CVSS

5.4MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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