CVE-2019-18835

—

CVSS 3.1

9.8 critical

EPSS

<1%p56

Published

Nov 8, 2019 (Nov 8, 2019)

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.

Vendors: matrix
Products: synapse
Weakness: CWE-345
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.9%)

In the news0 stories

No ingested article mentions this CVE yet.