CVE-2019-18835 is a critical vulnerability affecting Matrix Synapse versions prior to 1.5.0, where the software improperly validates signatures on federation APIs for /send_join, /send_leave, and /invite events. This allows for the potential acceptance of unsigned or spoofed events from unexpected servers. With a CVSS score of 9.8 (Critical), it presents a high-impact, low-complexity remote attack vector, leading to potential complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation, nor publicly available exploit code in common databases, the vulnerability has garnered significant community discussion, indicating awareness within the security community.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.5.0CPE matchmatch criteria | cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.