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Vulnerability record · CVE-2026-74869 · published 17 August 2026

CVE-2026-74869: Missing authorization vulnerability

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.

8.3 CVSS 4.0 High EPSS 0.35% · top 73.5% CWE-862 · Missing authorization Deferred
8.3CVSS 4.0 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
24 Sep 2026Last modified by NVD

Description

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/stoatchat/stoatchat/security/advisories/GHSA-jj3j-9qr7-jgfc
https://www.vulncheck.com/advisories/stoatchat-before-missing-authorization-via-subscribe

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Source: NIST National Vulnerability Database (record CVE-2026-74869), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.