1MCP Agent (@1mcp/agent) 0.20.0 through 0.39.0 contains an incorrect authorization vulnerability that allows authenticated clients to bypass OAuth tag-scope enforcement using negated advanced tag-filter expressions. Attackers holding a single-tag token can send a filter like not <granted-tag> to list and invoke tools on backend MCP servers outside their granted scopes.
Metrics
Affected Vendors & Products
References
History
Tue, 13 Oct 2026 19:30:00 +0000
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ssvc
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Sun, 11 Oct 2026 12:45:00 +0000
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| First Time appeared |
1mcp-app
1mcp-app agent |
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| Vendors & Products |
1mcp-app
1mcp-app agent |
Sat, 10 Oct 2026 16:30:00 +0000
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| Description | 1MCP Agent (@1mcp/agent) 0.20.0 through 0.39.0 contains an incorrect authorization vulnerability that allows authenticated clients to bypass OAuth tag-scope enforcement using negated advanced tag-filter expressions. Attackers holding a single-tag token can send a filter like not <granted-tag> to list and invoke tools on backend MCP servers outside their granted scopes. | |
| Title | 1MCP Agent 0.20.0 through 0.39.0 OAuth Tag-Scope Bypass via Negated Tag Filter | |
| Weaknesses | CWE-863 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-10-10T16:14:10.297Z
Updated: 2026-10-13T18:27:18.799Z
Reserved: 2026-10-10T16:07:40.380Z
Link: CVE-2026-108586
Updated: 2026-10-13T18:27:15.402Z
Status : Deferred
Published: 2026-10-10T17:17:00.593
Modified: 2026-10-16T19:21:14.417
Link: CVE-2026-108586
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