CVE-2026-77366: obsidian-tc

The National Vulnerability Database (NVD) record says that before obsidian-tc 1.3.1 any valid token could select another configured vault through Model Context Protocol (MCP) tool calls and read, write or delete its contents; 1.3.1 binds tokens and request context to a vault.

The record

Kind

Vulnerability

Source record

CVE-2026-77366: obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. Prior to 1.3.1, tool (National Vulnerability Database record)

Record published

2026-10-12

Posted here

2026-10-13

World

Software agents · Enterprise work agents

Controls concerned

Authority binding C-A2; Hard domain restriction C-E2

Checked

Checked against its record on 2026-10-22 by a reader who did not draft it; report verification/reports/SIG-2026-10-13-002-2026-10-22.md.

A signal's controls are the ones its record points at, the exposure; a case's controls are the ones its records show were absent or failed, so the two can differ.

Corrections

Changes to what this signal says, with the reason. Every earlier version is kept.

• 2026-10-22: Summary. Plain-language rule: abbreviations spelled out at first use (NVD, MCP, SDK). No claim changed. 22 October 2026.
  Show the change

  Before: The NVD record says that before obsidian-tc 1.3.1 any valid token could select another configured vault through MCP tool calls and read, write or delete its contents; 1.3.1 binds tokens and request context to a vault.

  After: The National Vulnerability Database (NVD) record says that before obsidian-tc 1.3.1 any valid token could select another configured vault through Model Context Protocol (MCP) tool calls and read, write or delete its contents; 1.3.1 binds tokens and request context to a vault.

What a signal is. A signal records what a primary record says; it assigns no fault. It is lighter than a case: one dated item from one record, tagged with the world, sector and controls it touches. It becomes a case when it meets the bar for one.

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