# CVE-2026-49405: OpenHuman: Unauthenticated server-sent events endpoint leaks user-facing event data

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

OpenHuman is an open-source agent harness available as a desktop application and Rust library. Before 0.56.0, the local server exposes the server-sent events endpoint at /events without bearer authentication, permits cross-origin browser access, and uses only a caller-supplied client_id to select WebChannelEvent objects from the process-wide event bus. An unauthenticated local client, or an attacker-hosted web page opened by the victim, can subscribe to another client's stream by supplying a known or guessed identifier; the fixed system identifier makes the proactive-message stream predictable. The exposed events can include complete assistant responses, streamed message content, tool names, tool arguments, and raw tool outputs intended for the local user interface. This issue is fixed in version 0.56.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- tinyhumansai / openhuman: < 0.56.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 6.2 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-200, CWE-306

## Exploit evidence

- exploit: https://github.com/tinyhumansai/openhuman/security/advisories/GHSA-4c8x-994p-6x9v (ADP: CISA-ADP)

## References

- https://github.com/tinyhumansai/openhuman/security/advisories/GHSA-4c8x-994p-6x9v (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/tinyhumansai/openhuman/pull/2331 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/tinyhumansai/openhuman/commit/b1bbc53fceed7d1f0cff90cbb0a42f4ab8e153a1 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/tinyhumansai/openhuman/releases/tag/v0.56.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/tinyhumansai/openhuman/security/advisories/GHSA-4c8x-994p-6x9v (ADP: CISA-ADP; exploit)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-49405; retrieved 2026-11-05; source updated 2026-11-05

Revision: 37a313693665baa871d3872195ef2e870da03e6398b5b9f5df1fcf7e66ff44c2

Canonical: https://y2.dev/cve/CVE-2026-49405

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