1MCP Agent 0.20.0 through 0.39.0 OAuth Tag-Scope Bypass via Negated Tag Filter
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 to list and invoke tools on backend MCP servers outside their granted scopes.
CVE-2026-108586
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-108586
@1mcp/agent
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/1mcp-app/agent",
"vendor": "1mcp-app",
"product": "@1mcp/agent",
"versions": [
{
"status": "affected",
"version": "0.20.0",
"versionType": "semver",
"lessThanOrEqual": "0.39.0"
}
],
"packageURL": "pkg:npm/%401mcp/agent",
"collectionURL": "https://www.npmjs.com/package/@1mcp/agent",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-108586
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #20574 · Revision 1
- Added to Heist Feed
- Publisher date