matrix-js-sdk has insufficient validation when considering a room to be upgraded by another

LOW 2.7CVE-2025-59160 · GHSA-mp7c-m3rh-r56v · Published 16/09/2025 · updated 17/06/2026

In short

CVE-2025-59160 is a LOW (CVSS 2.7) vulnerability affecting matrix-js-sdk.
Chance of exploitation in the next 30 days (EPSS): 0.24%, higher than 15.5% of all vulnerabilities.
Fix: update to 38.2.0 or later.

Package	Affected versions	Patched versions
matrix-js-sdk npm	`< 38.2.0`	`38.2.0`

Description

Impact

matrix-js-sdk before 38.2.0 has insufficient validation of room predecessor links in MatrixClient::getJoinedRooms, allowing a remote attacker to attempt to replace a tombstoned room with an unrelated attacker-supplied room.

Patches

The issue has been patched and users should upgrade to 38.2.0.

Workarounds

Avoid using MatrixClient::getJoinedRooms in favour of getRooms() and filtering upgraded rooms separately.

NVD description

Matrix JavaScript SDK is a Matrix Client-Server SDK for JavaScript and TypeScript. matrix-js-sdk before 38.2.0 has insufficient validation of room predecessor links in MatrixClient::getJoinedRooms, allowing a remote attacker to attempt to replace a tombstoned room with an unrelated attacker-supplied room. The issue has been patched and users should upgrade to 38.2.0. A workaround is to avoid using MatrixClient::getJoinedRooms in favor of getRooms() and filtering upgraded rooms separately.