the-40-thieves/obsidian-tc · Security
obsidian-tc : Symlink read-ACL scope bypass via lexical path checks
- GHSA ID
- GHSA-c5xx-h28h-f682
- CVE ID
- CVE-2026-77361
- Severity
- medium
- Published
- Updated
- CVSS
- 4.7 · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- CVSS v3
- 4.7 · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Description
Impact
ACL checks ran on the lexical vault-relative path while containment used the realpath. An in-vault symlink placed under an allowed glob, whose realpath resolved into a denied folder, passed the read ACL — an intra-vault read-ACL-scope bypass. It requires an out-of-band-planted symlink (no MCP tool creates one) and is not a vault-root escape.
Patches
Fixed in 1.3.1. Upgrade to >= 1.3.1. ACL enforcement now derives the realpath vault-relative path and feeds a single unified predicate at every site.
Workarounds
Do not permit untrusted symlinks inside the vault.
CWEs
- CWE-59 · Improper Link Resolution Before File Access ('Link Following')
- CWE-863 · Incorrect Authorization
References
- https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-c5xx-h28h-f682 ↗
- https://github.com/The-40-Thieves/obsidian-tc/pull/76 ↗
- https://github.com/The-40-Thieves/obsidian-tc/commit/c81d1687e2cfec98a0d8bc5038c029f41ea9c920 ↗
- https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1 ↗
- https://nvd.nist.gov/vuln/detail/cve-2026-77361 ↗
- https://github.com/advisories/GHSA-c5xx-h28h-f682 ↗