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CVE-2026-45076

Published: May 28, 2026

Modified: Jun 2, 2026

PUBLISHED

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.

Vendor	Product	Versions
element-hq	synapse	affected `< 1.152.1`

Weaknesses (CWE)

References

https://github.com/element-hq/synapse/security/advisories/GHSA-6qf2-7x63-mm6v

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CVE-2026-45076 - Security Vulnerability | QwikSec