CVE-2026-77363CWE-1385CWE-346

CVE-2026-77363

High · published October 12, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
4.5
In the wild
Unconfirmed
What it is

obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. Prior to 1.3.1, the Streamable HTTP transport does not validate the Host or Origin header or enable DNS-rebinding protection. When the documented loopback configuration uses auth.mode set to none, a malicious web page can send requests to the local MCP endpoint and receive unrestricted vault access through the http-local caller. Version 1.3.1 fixes the vulnerability by enabling host, origin, and DNS-rebinding validation.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00157 · 4.5th percentile
Weaknesses
CWE-1385 · Missing Origin Validation in WebSockets; CWE-346 · Origin Validation Error
Published
2026-10-12T22:17Z
References (4)
https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928 · [email protected]https://github.com/The-40-Thieves/obsidian-tc/pull/74 · [email protected]https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1 · [email protected]https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx · [email protected]
EPSS history
Timeline
  • 14 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 12 OCT 17:45Z
    obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access
    cvelistv5
  • 12 OCT 17:45Z
    obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access
    cvelistv5