Auth bypass in Teamwiseflow Xiaobei
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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (52.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/TeamWiseFlow/xiaobei (product)
- github.com/TeamWiseFlow/xiaobei/blob/v5.5.2/awada/awada-server/src/routes/webho… (technical-description)
- github.com/TeamWiseFlow/xiaobei/issues/440 (issue-tracking)
- www.vulncheck.com/advisories/xiaobei-through-5.5.2-unauthenticated-webhook-mess… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85667?
- CVE-2026-85667 is a critical-severity vulnerability in Teamwiseflow Xiaobei, 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.