What is CVE-2026-74869?

CVE-2026-74869 is a high-severity vulnerability in Stoatchat, classified under Missing Authorization. CVSS score: 7.7/10. Published 2026-08-17.

How severe is CVE-2026-74869?

High severity. CVSS v3 base score is 7.7 out of 10.

Auth bypass in Stoatchat

CVE-2026-74869

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.

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Stoatchat — versions 0, 0.15.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-74869?: CVE-2026-74869 is a high-severity vulnerability in Stoatchat, classified under Missing Authorization. CVSS score: 7.7/10. Published 2026-08-17.
How severe is CVE-2026-74869?: High severity. CVSS v3 base score is 7.7 out of 10.