Auth bypass in Unicomai Wanwu
CVE-2026-108856
UnicomAI Wanwu through 0.6.5 contains an authorization bypass vulnerability that allows authenticated users to mint AppKeys bound to other users' MCP servers via POST /v1/appspace/app/key. Attackers supplying a victim's MCP server UUID with appType mcpserver can open MCP sessions and invoke the server's tools using the victim's upstream authentication.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/unicomai-wanwu-mcp-key-arbitrary-resource (third-party-advisory)
- github.com/UnicomAI/wanwu/blob/v0.6.5/internal/app-service/client/orm/app_key.go (technical-description)
- github.com/UnicomAI/wanwu/blob/v0.6.5/internal/bff-service/server/http/middlewa… (technical-description)
- github.com/UnicomAI/wanwu (product)
- www.vulncheck.com/advisories/unicomai-wanwu-through-0.6.5-authorization-bypass-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-108856?
- CVE-2026-108856 is a medium-severity vulnerability in Unicomai Wanwu, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.2/10. Published 2026-10-11.
- How severe is CVE-2026-108856?
- Medium severity. CVSS v3 base score is 4.2 out of 10.