CVE-2019-18835

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-345

Affected software

No affected versions have been published.

Timeline

Published: Nov 8, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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