Access Control Vulnerability in Obsidian TC Model Context Protocol Server
CVE-2026-77362

4.3MEDIUM

Key Information:

Vendor

The-40-thieves

Status
Obsidian-tc
Vendor
CVE Published:
13 October 2026

What is CVE-2026-77362?

The Obsidian TC Model Context Protocol server, prior to version 1.3.1, exhibits an access control vulnerability that allows authenticated users to infer or access data from notes outside their designated read permissions. Specific components, such as the tasks_filter tool and the list_templates, fail to adequately enforce the read access control list (ACL). This oversight may expose sensitive information and template paths to unauthorized users. The vulnerability is mitigated in version 1.3.1 with improved filtering and read whitelist checks for these fields.

Affected Version(s)

obsidian-tc < 1.3.1

References

https://github.com/The-40-Thieves/obsidian-tc/security/ad...
x_refsource_CONFIRM
https://github.com/The-40-Thieves/obsidian-tc/pull/75
x_refsource_MISC
https://github.com/The-40-Thieves/obsidian-tc/commit/5ab2...
x_refsource_MISC

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.