CVE-2026-77363 obsidian-tc - CORS Misconfiguration & Information Disclosure

obsidian-tc prior to 1.3.1 contains a CORS misconfiguration caused by lack of Host and Origin header validation and missing DNS-rebinding protection in Streamable HTTP transport, letting malicious web pages access local MCP endpoints and vaults when auth.mode is none, exploit requires loopback configuration with auth.mode set to none.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
CORS Misconfiguration
Impact
Cors Misconfiguration, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
12 October 2026
Updated
15 October 2026
Weakness
CWE-346

Vendor fix

Update to version 1.3.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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