CVE-2026-6729

MEDIUM 6.3

HKUDS OpenHarness Session Key Collision Privilege Escalation

CVSS Score

6.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-287
Vendor	hkuds
Product	openharness
Published	Apr 20, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Affected Versions

HKUDS / OpenHarness

0 < PR #159

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/HKUDS/OpenHarness/pull/159 github.com: https://github.com/HKUDS/OpenHarness/commit/3186851c479ee714a9bb9aa6cd77017db7e589e2 vulncheck.com: https://www.vulncheck.com/advisories/hkuds-openharness-session-key-collision-privilege-escalation

Credits

Chia Min Jun Lennon