What is CVE-2026-77363?

CVE-2026-77363 is a high-severity vulnerability, classified under Origin Validation Error. CVSS score: 8.8/10. Published 2026-10-12.

How severe is CVE-2026-77363?

High severity. CVSS v3 base score is 8.8 out of 10.

CVE-2026-77363

CVE-2026-77363

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.

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-77363?: CVE-2026-77363 is a high-severity vulnerability, classified under Origin Validation Error. CVSS score: 8.8/10. Published 2026-10-12.
How severe is CVE-2026-77363?: High severity. CVSS v3 base score is 8.8 out of 10.