CVE-2026-45076

2.7 LOW

Synapse is an open source Matrix homeserver implementation

Published: 2026-05-28 · Last updated: 2026-06-04

Severity and scoring

CVSS: 2.7 LOW
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
CWE: CWE-20

Affected products

Vendor	Product
element	synapse

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-45076
[Vendor advisory]https://github.com/element-hq/synapse/security/advisories/GHSA-6qf2-7x63-mm6v

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