---
id: CVE-2026-6729
title: HKUDS OpenHarness Session Key Collision Privilege Escalation
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 by exploiting a shared ohmo
  session key that…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-287
vendor: HKUDS
product: OpenHarness
affected:
  - 'OpenHarness < PR #159'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-04-21T17:39:09.526862Z'
published: '2026-04-20'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:08:08.965Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-6729'
references:
  - url: 'https://github.com/HKUDS/OpenHarness/pull/159'
  - url: >-
      https://github.com/HKUDS/OpenHarness/commit/3186851c479ee714a9bb9aa6cd77017db7e589e2
  - url: >-
      https://www.vulncheck.com/advisories/hkuds-openharness-session-key-collision-privilege-escalation
tags:
  - cve.org
epss: 0.00197
epssPercentile: 0.09485
ingestedAt: '2026-11-08T14:51:22.266Z'
---

## Overview

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.

## Affected

- `OpenHarness < PR #159`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.