CVE-2023-28427: Matrix JavaScript SDK

High severity, CVSS 8.2. EPSS: 1.2% chance of exploitation in the next 30 days.

matrix-js-sdk is a Matrix messaging protocol Client-Server SDK for JavaScript. In versions prior to 24.0.0 events sent with special strings in key places can temporarily disrupt or impede the matrix-js-sdk from functioning properly, potentially impacting the consumer's ability to process data safely. Note that the matrix-js-sdk can appear to be operating normally but be excluding or corrupting runtime data presented to the consumer. This vulnerability is distinct from GHSA-rfv9-x7hh-xc32 which covers a similar issue. The issue has been patched in matrix-js-sdk 24.0.0 and users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• Matrix JavaScript SDK: before 24.0.0 (fixed in 24.0.0)

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