{"id":"CVE-2026-77361","aliases":["EUVD-2026-98694","GHSA-c5xx-h28h-f682"],"status":"published","title":"obsidian-tc symlink path mismatch bypasses read ACL restrictions","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.","severity":{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00113,"percentile":0.01436,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-59","CWE-863"],"published":"2026-10-13T14:00:39Z","modified":"2026-10-28T02:31:02Z","fixes":[{"ecosystem":"npm","package":"obsidian-tc","fixed_in":["1.3.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"obsidian-tc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.1"}]}]},{"source":"osv","ecosystem":"npm","package":"obsidian-tc","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.3.1"}]}]}],"products":[{"vendor":"the-40-thieves","product":"obsidian-tc"}],"references":[{"url":"https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-c5xx-h28h-f682","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/The-40-Thieves/obsidian-tc/pull/76","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/The-40-Thieves/obsidian-tc/commit/c81d1687e2cfec98a0d8bc5038c029f41ea9c920","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/cve-2026-77361","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-c5xx-h28h-f682"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77361.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77361","tags":["advisory"]},{"url":"https://github.com/The-40-Thieves/obsidian-tc","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-77361","title":"obsidian-tc symlink path mismatch bypasses read ACL restrictions","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.","status":"published","published":"2026-10-13T14:00:39.982Z","modified":"2026-10-16T21:58:14.281Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-59","CWE-863"],"updated_at":"2026-11-02T14:20:15.712761Z"}],"euvd":[{"id":"EUVD-2026-98694","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.","status":"published","published":"2026-10-13T14:00:39Z","modified":"2026-10-16T21:58:14Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T17:00:01.37578Z"}],"ghsa":[{"id":"GHSA-c5xx-h28h-f682","title":"obsidian-tc : Symlink read-ACL scope bypass via lexical path checks","description":"### Impact\nACL 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.\n\n### Patches\nFixed in **1.3.1**. Upgrade to `\u003e= 1.3.1`. ACL enforcement now derives the realpath vault-relative path and feeds a single unified predicate at every site.\n\n### Workarounds\nDo not permit untrusted symlinks inside the vault.","status":"published","published":"2026-10-23T17:28:19Z","modified":"2026-10-23T17:28:20Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-59","CWE-863"],"updated_at":"2026-11-02T14:41:35.723785Z"}],"nvd":[{"id":"CVE-2026-77361","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.","status":"published","published":"2026-10-13T14:17:42.343Z","modified":"2026-10-16T22:17:55.79Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-59","CWE-863"],"updated_at":"2026-11-02T14:12:57.132005Z"}],"osv":[{"id":"CVE-2026-77361","title":"obsidian-tc symlink path mismatch bypasses read ACL restrictions","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.","status":"published","published":"2026-10-13T14:00:39.982Z","modified":"2026-10-28T02:31:02.35556595Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-59","CWE-863"],"updated_at":"2026-11-02T15:45:17.102988Z"},{"id":"GHSA-c5xx-h28h-f682","title":"obsidian-tc : Symlink read-ACL scope bypass via lexical path checks","description":"### Impact\nACL 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.\n\n### Patches\nFixed in **1.3.1**. Upgrade to `\u003e= 1.3.1`. ACL enforcement now derives the realpath vault-relative path and feeds a single unified predicate at every site.\n\n### Workarounds\nDo not permit untrusted symlinks inside the vault.","status":"published","published":"2026-10-23T17:28:19Z","modified":"2026-10-23T17:45:03.921444112Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-59","CWE-863"],"updated_at":"2026-11-02T15:46:44.571161Z"}]}}