matrix-js-sdk has insufficient MXC URI validation which allows client-side path traversal
Summary
matrix-js-sdk before 34.11.0 is vulnerable to client-side path traversal via crafted MXC URIs. A malicious room member can trigger clients based on the matrix-js-sdk to issue arbitrary authenticated GET requests to the client's homeserver.
Details
The Matrix specification demands homeservers to perform validation of the server-name and media-id components of MXC URIs with the intent to prevent path traversal. However, it is not mentioned that a similar check must also be performed on the client to prevent client-side path traversal. matrix-js-sdk fails to perform this validation.
Patches
Fixed in matrix-js-sdk 34.11.1.
Workarounds
None.
References
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | matrix-js-sdk | < 34.11.1 | 34.11.1 |
References
- https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-xvg8-m4x3-w6xr
- https://nvd.nist.gov/vuln/detail/CVE-2024-50336
- https://github.com/matrix-org/matrix-js-sdk
- https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html
- https://spec.matrix.org/v1.12/client-server-api/#security-considerations-5
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N- Weakness (CWE)
CWE-22- Platform
- npm
- Package
matrix-js-sdk- Disclosed
- 12.11.2024
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-xvg8-m4x3-w6xr - CC BY 4.0
Vulnerability history: matrix-js-sdk
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 12
- First → latest
- 09.2021 09.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 6
- Medium 6
Disclosures per year
- 2021: 1
- 2022: 4
- 2023: 3
- 2024: 3
- 2025: 1
- 2026: 0
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matrix-js-sdk has insufficient MXC URI validation which allows client-side path traversal this entry
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