CVE-2026-77363Network attack vectorHinoki check available

Vault read/write access via unchecked HTTP request origins

Published Oct 12, 2026 · Updated Oct 12, 2026

Origin validation failure in The-40-Thieves obsidian-tc before 1.3.1 allows remote attackers to read and write vault data via a malicious web page. The Streamable HTTP /mcp handler accepts untrusted Host and Origin headers without validation or DNS-rebinding protection, assigning requests the http-local caller with wildcard scopes. Exploitation requires the HTTP transport running with auth.mode set to none and a user visiting the malicious page; access extends to vault data exposed by that server.

CVSS severity9.6
Critical
EPSS probability0.16%
Next 30 days · Oct 18, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Origin validation failure in The-40-Thieves obsidian-tc before 1.3.1 allows remote attackers to read and write vault data via a malicious web page. The Streamable HTTP /mcp handler accepts untrusted Host and Origin headers without validation or DNS-rebinding protection, assigning requests the http-local caller with wildcard scopes. Exploitation requires the HTTP transport running with auth.mode set to none and a user visiting the malicious page; access extends to vault data exposed by that server.

The record

CVE
CVE-2026-77363
Published
Oct 12, 2026
Updated
Oct 12, 2026
Vendor
The-40-Thieves
Product
obsidian-tc
Classifications
CWE-346, CWE-1385, T1189, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The-40-Thieves · obsidian-tcversion=< 1.3.1

Published CVSS scores

9.6The-40-ThievesCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
CWE-1385Missing Origin Validation in WebSockets
T1189Drive-by Compromise
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started