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

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-23 · updated 2026-10-26
Weakness: CWE-862

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.

Affected products

HKUDS OpenHarness: through 0.1.9

References

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

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