Data Integrity Risk in Obsidian-TC Model Context Protocol Server
CVE-2026-115478

7.1HIGH

Key Information:

Vendor

The-40-thieves

Status
Obsidian-tc
Vendor
CVE Published:
23 October 2026

What is CVE-2026-115478?

The Obsidian-TC Model Context Protocol server is susceptible to a data integrity vulnerability that compromises note ownership and lifecycle consistency. In versions ranging from 1.0.1 to 1.31.3, operations such as 'create_entity', 'link_entities', 'rename_entity', 'unlink_entities', and 'delete_entity' do not preserve ownership reliably, potentially allowing an authorized user to overwrite notes erroneously during shared materialization. A failed operation can lead to inconsistent data states, and specific actions like 'rename_entity' can write unverified data to existing notes, further exacerbating the risk. Solutions employing 'restore_note' can mitigate some concerns through snapshotting, but these are only effective if snapshots are enabled. This flaw has been rectified in version 1.31.4.

Affected Version(s)

obsidian-tc >= 1.0.1, < 1.31.4

References

https://github.com/The-40-Thieves/obsidian-tc/security/ad...
x_refsource_CONFIRM
https://github.com/The-40-Thieves/obsidian-tc/pull/978
x_refsource_MISC
https://github.com/The-40-Thieves/obsidian-tc/commit/99f7...
x_refsource_MISC

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.