CVE-2024-50336: matrix-js-sdk has insufficient MXC URI validation which allows client-side path traversal

Severity: medium (CVSS 5.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-12 · updated 2026-06-17
Weakness: CWE-22

Description

matrix-js-sdk is a Matrix messaging protocol Client-Server SDK for JavaScript. 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. Fixed in matrix-js-sdk 34.11.1.

Affected products

matrix-org matrix-js-sdk: before 34.11.1

References

https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-xvg8-m4x3-w6xr
https://spec.matrix.org/v1.12/client-server-api/#security-considerations-5
https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html

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