CVE-2026-6729
MediumCVSS 6.3Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
HKUDS OpenHarness prior to PR #159 remediation contains a session key derivation vulnerability that allows authenticated participants in shared chats or threads to hijack other users' sessions. This stems from a shared ohmo session key lacking sender identity verification, enabling reuse of another user's conversation state and interruption of their active tasks.
Risk Assessment
A participant in a shared chat can hijack another user's session, access their conversation state, and disrupt their running tasks.
Recommendation
Apply the PR #159 fix or update OpenHarness to a version containing this remediation to enforce sender identity verification in the session key.
Other vulnerabilities in HKUDS OpenHarness
See all- CVE-2026-7551High
HKUDS OpenHarness contains a remote code execution vulnerability in the /bridge slash command that allows remote senders accepted by configuration to execute arbitrary operating system commands. Attackers can invoke the /bridge spawn command with attacker-controlled command text, leading to execution through the bridge session manager.
- CVE-2026-6823High
HKUDS OpenHarness prior to PR #147 remediation contains an insecure default configuration vulnerability where remote channels inherit allow_from = ["*"] permitting arbitrary remote senders to pass admission checks.
- CVE-2026-6819High
HKUDS OpenHarness prior to PR #156 remediation exposes plugin lifecycle commands including /plugin install, /plugin enable, /plugin disable, and /reload-plugins to remote senders by default. Attackers who gain access through the channel layer can remotely manage plugin trust and activation state, enabling unauthorized plugin installation and activation on the system.
Original NVD description (English source)
HKUDS OpenHarness prior to PR #159 remediation contains a session key derivation vulnerability that allows authenticated participants in shared chats or threads to hijack other users' sessions by exploiting a shared ohmo session key that lacks sender identity verification. Attackers can reuse another user's conversation state and replace or interrupt their active tasks by colliding into the same session boundary through the shared chat or thread scope.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS