critical · 9.9 Patched

obsidian-tc tokens can access arbitrary configured vaults

CVE-2026-77366 · GHSA-84c9-qqpq-2pq5 · published 23 Oct 2026

How serious is it

  • Severity: critical, CVSS score 9.9 out of 10.
  • No exploit prediction (EPSS) score yet.
  • Not on the CISA list of exploited vulnerabilities.
  • No public exploit in Exploit-DB.

Is your app affected by CVE-2026-77366?

Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.

Who is affected

  • obsidian-tc (npm) < 1.3.1

How to check

  1. Run npm ls obsidian-tc in your project to see the installed version, including copies pulled in by other packages.
  2. Or paste your lockfile into the checker: it lists every package with a known vulnerability, this one included.
  3. Or run npx shippable-dev scan localhost:3000 in your project folder. It reads your lockfile and flags this vulnerability along with every other known one.

How to fix

Copies a prompt for Claude Code, Cursor or Codex: it checks your lockfiles for this and upgrades it.
  1. Upgrade obsidian-tc to 1.3.1 or later, commit the lockfile and redeploy.
  2. If a vulnerable version was live, check your logs and rotate the secrets that server could read.

The advisory

### Impact Tool dispatch did not check the caller-supplied `input.vault` against the caller's bound vault (`ctx.vaultId`); the folder ACL was a single global instance and the JWT carried no vault claim. As a result, **any valid token could read, write, or delete any configured vault** by passing `input.vault`, defeating multi-tenant isolation across ~90 tool sites. (`resources/read` was the only surface that already guarded this.) ### Patches Fixed in **1.3.1** (the fix was developed on the `v1.3.0` tag, which never published to npm; 1.3.1 is the first published release with the fix). Upgrade to `>= 1.3.1`. ### Workarounds Run a single vault per server process, or isolate each tenant on a separate process/credential. ### Fix A central `input.vault === ctx.vaultId` guard was added in dispatch before the scope check.

Check your whole app

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References

Merged from GitHub Advisory Database, OSV. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON

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