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CVE

CVE-2026-54618

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

CVE-2026-54618

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

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 VAULTMCPTOKEN without authenticating a client. An unauthenticated remote caller who can reach the intended tunnel deployment can therefore call /mcp and use vaultread, vaultwrite, vaultsearch, vaultlist, vaultmove, and vaultdelete against the entire vault. Optional PKCE does not prevent an attacker-initiated flow, and unauthenticated /oauth/register also exposes a clientcredentials path by returning the configured VAULTOAUTHCLIENTSECRET. This issue is fixed in version 0.2.0.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.4
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
C
H
U
-

Related Resources

No items found.

References

https://github.com/jimprosser/obsidian-web-mcp/releases/tag/v0.2.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54618.json, https://github.com/jimprosser/obsidian-web-mcp/security/advisories/GHSA-hwhg-mrjc-8g43, https://nvd.nist.gov/vuln/detail/CVE-2026-54618, https://github.com/jimprosser/obsidian-web-mcp/commit/e4924f096ee7494a7999d6c0cceca9be08e48eef, https://github.com/jimprosser/obsidian-web-mcp/pull/30

Severity

9.4

CVSS Score
0
10

Basic Information

Base CVSS
9.4
EPSS Probability
0.00507%
EPSS Percentile
0.41786%
Introduced Version
0
Fix Available
e4924f096ee7494a7999d6c0cceca9be08e48eef

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