What is CVE-2026-85667?

CVE-2026-85667 is a critical-severity vulnerability, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-09-04.

How severe is CVE-2026-85667?

Critical severity. CVSS v3 base score is 9.1 out of 10.

CVE-2026-85667

CVE-2026-85667

xiaobei through 5.5.2 fails to implement authentication or signature validation on webhook endpoints, allowing unauthenticated attackers to inject arbitrary messages into the agent pipeline. Attackers can publish malicious messages via the /webhook_worktool handler and exploit unvalidated media URL fetching to perform server-side request forgery against internal services.

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

disclosure@vulncheck.com
disclosure@vulncheck.com
disclosure@vulncheck.com
disclosure@vulncheck.com

Frequently asked questions

What is CVE-2026-85667?: CVE-2026-85667 is a critical-severity vulnerability, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-09-04.
How severe is CVE-2026-85667?: Critical severity. CVSS v3 base score is 9.1 out of 10.