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CVE-2021-43800

Asset directory traversal with some storage modules on Windows

HIGH
7.5
CVSS Score
Published: December 6, 2021 at 06:50 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
1 product affected across 1 vendorWiki.js· also runs on 1 platform

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

Wiki.js is a wiki app built on Node.js. Prior to version 2.5.254, directory traversal outside of Wiki.js context is possible when a storage module with local asset cache fetching is enabled on a Windows host. A malicious user can potentially read any file on the file system by crafting a special URL that allows for directory traversal. This is only possible on a Wiki.js server running on Windows, when a storage module implementing local asset cache (e.g Local File System or Git) is enabled and that no web application firewall solution (e.g. cloudflare) strips potentially malicious URLs. Commit number 414033de9dff66a327e3f3243234852f468a9d85 fixes this vulnerability by sanitizing the path before it is passed on to the storage module. The sanitization step removes any windows directory traversal sequences from the path. As a workaround, disable any storage module with local asset caching capabilities (Local File System, Git).

Affected

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

Wiki.js· Requarks
95%
v < 2.5.245v < 2.5.254
Affected range stops below 2.5.245, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.5.254, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

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/414033de9dff66a327e3f3243234852f468a9d85
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/Requarks/wiki/releases/tag/2.5.254
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/Requarks/wiki/security/advisories/GHSA-r363-73gj-6j25

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-22

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