CVE-2026-11717
- Source
- https://cve.org/CVERecord?id=CVE-2026-11717
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11717.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-11717
- Aliases
- Published
- 2026-06-18T11:50:23.665Z
- Modified
- 2026-07-08T08:12:39.869675122Z
- Severity
-
- 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- [none]
- Details
-
An authentication bypass vulnerability exists in the generic opaque token validation path (validateOpaqueToken) of googleapis/mcp-toolbox.
When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint (RFC 7662), the toolbox decodes the response into an introspectResp struct where the Active field is declared as a pointer to a boolean (*bool). The code only explicitly rejects a token if the response contains a populated active field set to false (if introspectResp.Active != nil && !*introspectResp.Active). If an introspection endpoint responds with a payload that completely omits the mandatory active key, the internal variable remains nil, causing the conditional check to short-circuit. As a result, Toolbox accepts authorization tokens missing the "active" field, granting access to protected tools and underlying data sources.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11717.json", "cna_assigner": "Google", "cwe_ids": [ "CWE-287" ] }- References