VULNERABILITY INTELLIGENCE

CVE-2026-45076

CVSS score5.1 MEDIUM

EPSS probability0.37%

CISA KEVNot currently listed

Published2026-05-28

Last modified2026-10-26

Description

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This vulnerability is fixed in 1.152.1.