CVE-2026-6729

| EUVD-2026-23983 MEDIUM
2026-04-20 [email protected] GHSA-pvmf-7x77-8q82
Authentication Bypass
5.3
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Apr 20, 2026 - 23:00 vuln.today

DescriptionNVD

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.

AnalysisAI

Session key derivation in HKUDS OpenHarness prior to PR #159 fails to verify sender identity in shared chat/thread scopes, allowing authenticated users to hijack other participants' sessions and disrupt their active tasks through collision attacks on the shared ohmo session key. The vulnerability requires prior authentication and network access but enables lateral privilege escalation within collaborative environments. …

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CVE-2026-6729 vulnerability details – vuln.today
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