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Vulnerabilities

Security fix · CVE-2026-77363

obsidian-tc HTTP transport lacks Origin/DNS-rebinding protection, enabling drive-by vault access on loopback

Published Oct 12, 2026 · catalog updated Oct 23, 2026 · The-40-Thieves

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-77363. EPSS is 0.15%. Act only if a listed version of The-40-Thieves is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Critical9.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.15%
Remediation
Version ranges on file
Affected products
npm obsidian-tc · vendor The-40-Thieves obsidian-tc

### Impact The Streamable HTTP transport was constructed without / / and performed no -header validation. With the documented loopback default, a **drive-by web page could ** and receive caller with scopes — full vault read/write — via DNS rebinding / a forged Origin. ### Patches Fixed in **1.3.1**. Upgrade to . The transport now enables DNS-rebinding protection and allowed hosts/origins and returns HTTP 403 on an invalid Origin (per MCP 2025-11-25). ### Workarounds Do not expose the HTTP transport with ; require JWT auth, or bind to a non-loopback interface behind a proxy that validates .

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm obsidian-tc< 1.3.1
  • vendor The-40-Thieves obsidian-tcversion unspecified

How to fix CVE-2026-77363

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-77363. EPSS is 0.15%. Act only if a listed version of The-40-Thieves is installed.

Which versions are affected?

Compare what you have installed with < 1.3.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1385; CWE-346. EPSS 0.15%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 23, 2026 · GitHub Advisory Database

    Detected

    ### Impact The Streamable HTTP transport was constructed without / / and performed no -header validation. With the documented loopback default, a **drive-by web page could ** and receive caller with scopes — full vault read/write — via DNS rebinding / a forged Origin. ### Patches Fixed in **1.3.1**. Upgrade to . The transport now enables DNS-rebinding protection and allowed hosts/origins and retur

  2. Oct 23, 2026 · GitHub Advisory Database

    Updated

    ### Impact The Streamable HTTP transport was constructed without / / and performed no -header validation. With the documented loopback default, a **drive-by web page could ** and receive caller with scopes — full vault read/write — via DNS rebinding / a forged Origin. ### Patches Fixed in **1.3.1**. Upgrade to . The transport now enables DNS-rebinding protection and allowed hosts/origins and retur

Sources

  • CVE.orgVulnerability recordCVE-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

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-77363

    30-day exploitation probability 0.15%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-pqh8-4pj7-32xx

    obsidian-tc HTTP transport lacks Origin/DNS-rebinding protection, enabling drive-by vault access on loopback

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-77363

    The Streamable HTTP transport was constructed without enableDnsRebindingProtection/allowedHosts/allowedOrigins and performed no Origin-header validation. With the documented auth.mode: "none" loopback default, a drive-by web page could POST http://127.0.0.1/mcp and receive caller http-local with scopes ["*"] — full vault read/write — via DNS rebinding / a forged Origin.

    advisories.gitlab.com

References

Freshness

Last verified in this catalog Oct 25, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • GitLab Advisory DatabaseOct 25, 2026
  • FIRST EPSSOct 25, 2026
  • CVE.orgOct 23, 2026
  • GitHub Advisory DatabaseOct 23, 2026