CVE-2023-28103: Matrix-React-SDK Project Matrix-React-SDK

High severity, CVSS 8.2. EPSS: 0.7% chance of exploitation in the next 30 days.

matrix-react-sdk is a Matrix chat protocol SDK for React Javascript. In certain configurations, data sent by remote servers containing special strings in key locations could cause modifications of the `Object.prototype`, disrupting matrix-react-sdk functionality, causing denial of service and potentially affecting program logic. This is fixed in matrix-react-sdk 3.69.0 and users are advised to upgrade. There are no known workarounds for this vulnerability. Note this advisory is distinct from GHSA-2x9c-qwgf-94xr which refers to a similar issue.

Affected products

Published 2023-03-28. Last modified 2026-06-17.