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CVE-2026-77363

8.8 · HIGH

obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults.

Published Oct 12, 2026CWE-346EPSS 0.15%

Overview

CVE-2026-77363 is a high-severity vulnerability. It was published on October 12, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. Prior to 1.3.1, the Streamable HTTP transport does not validate the Host or Origin header or enable DNS-rebinding protection. When the documented loopback configuration uses auth.mode set to none, a malicious web page can send requests to the local MCP endpoint and receive unrestricted vault access through the http-local caller. Version 1.3.1 fixes the vulnerability by enabling host, origin, and DNS-rebinding validation.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928GitHubgithub.com/The-40-Thieves/obsidian-tc/pull/74GitHubgithub.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1GitHubgithub.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx

How CyberStrike helps

Frequently asked questions

What is CVE-2026-77363?

CVE-2026-77363 is a high-severity vulnerability. It was published on October 12, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-77363?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-77363?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-77363?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-77363 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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