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Case File

CVE-2019-18835

CRITICAL · CVSS 9.8 EPSS 0.86% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2019-11-08 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2019-18835
Severity
CRITICAL
CVSS
9.8
EPSS
0.86%

Original NVD 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.