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
2026-10-28T02:30:37Z
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
0 Unknown introduced commit / All previous commits are affected
Fixed
e4924f096ee7494a7999d6c0cceca9be08e48eef
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "0.2.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "e4924f096ee7494a7999d6c0cceca9be08e48eef"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v0.2.0",
            "range":  [
                {
                    "fixed":  "e4924f096ee7494a7999d6c0cceca9be08e48eef"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "0.2.0"
                }
            ],
            "source":  "DESCRIPTION"
        }
    ]
}

Database specific

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