Vulnerability · Published Oct 13, 2026 · Assigned by GitHub_M
CVE-2026-77361obsidian-tc symlink path mismatch bypasses read ACL restrictions
Medium 4.7
In plain English
A medium-severity incorrect authorization in obsidian-tc from The-40-Thieves. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. Prior to 1.3.1, read access-control list (ACL) checks use a lexical vault-relative path while containment checks use the resolved path. An in-vault symlink under an allowed glob that resolves into a denied folder can therefore bypass the read ACL and expose files in the denied folder. Exploitation requires an out-of-band-planted symlink and does not permit an escape from the vault root. Version 1.3.1 fixes the vulnerability by applying ACL checks to the resolved vault-relative path.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | obsidian-tc | 1.3.1 | GHSA-c5xx-h28h-f682 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The-40-Thieves | obsidian-tc | < 1.3.1 |
Weakness: CWE-59, CWE-863 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-c5xx-h28h-f682 x_refsource_CONFIRM
- https://github.com/The-40-Thieves/obsidian-tc/pull/76 x_refsource_MISC
- https://github.com/The-40-Thieves/obsidian-tc/commit/c81d1687e2cfec98a0d8bc5038c029f41ea9c920 x_refsource_MISC
- https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1 x_refsource_MISC