CVE-2026-108586

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Source

https://cve.org/CVERecord?id=CVE-2026-108586

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-108586.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-108586

Published

2026-10-10T16:14:10Z

Modified

2026-10-28T02:30:34Z

Severity

5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

1MCP Agent 0.20.0 through 0.39.0 OAuth Tag-Scope Bypass via Negated Tag Filter

Details

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.

Database specific

{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108586.json"
}

References

Affected packages

Git / github.com/1mcp-app/agent

Affected ranges

Type

GIT

Repo

https://github.com/1mcp-app/agent

Events

Introduced

e9cb1e643454bc6785aa88c256a7f01803b2506a

Last Affected

93cc6b27d7b31ebd7b40fddd1c4c3436bc5a71cf

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0.20.0"
                },
                {
                    "last_affected": "0.39.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "introduced": "0.20.0"
                },
                {
                    "last_affected": "0.39.0"
                }
            ],
            "source": "DESCRIPTION"
        }
    ]
}

Affected versions

v0.*

v0.20.0

v0.20.1

v0.20.2

v0.20.3

v0.21.0

v0.22.0

v0.22.1

v0.22.2

v0.22.3

v0.23.0

v0.23.1

v0.23.2

v0.24.0

v0.25.0

v0.25.1

v0.25.2

v0.25.3

v0.25.4

v0.25.5

v0.26.0

v0.26.1

v0.27.0

v0.27.1

v0.27.2

v0.27.3

v0.27.4

v0.28.0

v0.28.1

v0.29.0

v0.29.0-beta1

v0.29.0-beta2

v0.29.0-beta3

v0.29.0-beta4

v0.29.0-beta5

v0.29.0-beta6

v0.29.0-beta7

v0.29.1

v0.29.2

v0.30.0

v0.30.0-beta1

v0.30.1

v0.30.2

v0.30.3

v0.31.0

v0.31.0-beta1

v0.31.0-beta2

v0.31.0-beta3

v0.32.0

v0.32.0-beta1

v0.32.1

v0.32.2

v0.33.0

v0.33.0-beta1

v0.33.0-beta2

v0.33.0-beta3

v0.34.0

v0.34.1

v0.34.2

v0.34.3

v0.34.4

v0.35.0

v0.35.0-beta.1

v0.35.0-beta.2

v0.35.0-beta.3

v0.35.0-beta.4

v0.36.0

v0.37.0

v0.38.0

v0.38.1

v0.38.2

v0.39.0

v0.39.0-beta.0

v0.39.0-beta.1

v0.39.0-beta.2

v0.39.0-beta.3

v0.39.0-beta.4

v0.39.0-beta.5

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-108586.json"