CVE-2026-74869CWE-862broken-access-control

CVE-2026-74869

High · published August 17, 2026

CVSS v3.1

7.7

EPSS

Percentile

27.8

In the wild

Unconfirmed

What it is

stoatchat before 0.15.0 contains a missing authorization vulnerability in the Subscribe message handler that allows authenticated attackers to enumerate members and monitor profile updates of private servers without membership. Attackers can subscribe to any server's member-update topic by sending a Subscribe message with an arbitrary server ID, receiving live UserUpdate events including display names, avatars, and status changes for members they should not have access to.

The record

Technical detail

CVSS v3.1: 7.7 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CVSS v4.0: 8.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
EPSS: 0.00354 · 27.8th percentile
Weakness: CWE-862 · Missing Authorization
Published: 2026-08-17T15:16Z

References (2)

https://github.com/stoatchat/stoatchat/security/advisories/GHSA-jj3j-9qr7-jgfc · [email protected]https://www.vulncheck.com/advisories/stoatchat-before-missing-authorization-via-subscribe · [email protected]

EPSS history

Timeline

17 AUG 11:04Z
stoatchat before 0.15.0 Missing Authorization via Subscribe
cvelistv5