---
title: "CVE-2026-77363: obsidian-tc - CORS Misconfiguration & Information Disclosure"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-77363/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-77363)

## 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](https://cwe.mitre.org/data/definitions/346.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-77363](https://nvd.nist.gov/vuln/detail/CVE-2026-77363)
- [https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928](https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928)
- [https://github.com/The-40-Thieves/obsidian-tc/pull/74](https://github.com/The-40-Thieves/obsidian-tc/pull/74)
- [https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1](https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1)
- [https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx](https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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