CVE-2026-54618

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Source

https://cve.org/CVERecord?id=CVE-2026-54618

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54618.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-54618

Aliases

GHSA-hwhg-mrjc-8g43

Published

2026-09-17T19:45:15Z

Modified

2026-09-19T03:46:30Z

Severity

9.4 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L CVSS Calculator

Summary

Obsidian Web MCP: Unauthenticated vault access: /oauth/authorize auto-approves without authenticating the user

Details

Obsidian Web MCP is a secure remote MCP server for Obsidian vaults. Prior to 0.2.0, /oauth/authorize issues an authorization code without a login, consent, or session check, and /oauth/token can exchange that code for the static VAULT_MCP_TOKEN without authenticating a client. An unauthenticated remote caller who can reach the intended tunnel deployment can therefore call /mcp and use vault_read, vault_write, vault_search, vault_list, vault_move, and vault_delete against the entire vault. Optional PKCE does not prevent an attacker-initiated flow, and unauthenticated /oauth/register also exposes a client_credentials path by returning the configured VAULT_OAUTH_CLIENT_SECRET. This issue is fixed in version 0.2.0.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-306",
        "CWE-522",
        "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54618.json"
}

References

Affected packages

Git / github.com/jimprosser/obsidian-web-mcp

Affected ranges

Type

GIT

Repo

https://github.com/jimprosser/obsidian-web-mcp

Events

Introduced

Fixed

e4924f096ee7494a7999d6c0cceca9be08e48eef

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.2.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54618.json"