CVE-2026-6729: Improper Authentication (CWE-287) in HKUDS OpenHarness
CVE-2026-6729 is a medium severity vulnerability in HKUDS OpenHarness prior to the PR #159 remediation. It involves improper authentication due to a session key derivation flaw, allowing authenticated participants in shared chats or threads to hijack other users' sessions. The vulnerability arises because the shared ohmo session key lacks sender identity verification, enabling attackers to reuse another user's conversation state and interfere with their active tasks within the same session boundary.
AI Analysis
Technical Summary
This vulnerability in HKUDS OpenHarness affects versions prior to the PR #159 remediation and is classified as CWE-287 (Improper Authentication). The flaw is in the session key derivation mechanism used in shared chats or threads, where the ohmo session key is shared without verifying the sender's identity. This allows authenticated users within the same chat or thread to hijack other users' sessions by colliding into the same session boundary, effectively reusing conversation states and disrupting or replacing active tasks. The CVSS 4.0 base score is 5.3, indicating a medium severity with network attack vector, low complexity, and no user interaction required.
Potential Impact
An attacker who is an authenticated participant in a shared chat or thread can hijack other users' sessions by exploiting the shared session key that lacks sender identity verification. This can lead to unauthorized reuse of conversation states and interruption or replacement of active tasks of other users within the same session boundary. There is no indication of known exploits in the wild at this time.
Mitigation Recommendations
No official patch or remediation level has been published yet for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should be cautious when participating in shared chats or threads and consider limiting access to trusted participants only. Monitor vendor communications for updates regarding PR #159 or other official fixes.
CVE-2026-6729: Improper Authentication (CWE-287) in HKUDS OpenHarness
Description
CVE-2026-6729 is a medium severity vulnerability in HKUDS OpenHarness prior to the PR #159 remediation. It involves improper authentication due to a session key derivation flaw, allowing authenticated participants in shared chats or threads to hijack other users' sessions. The vulnerability arises because the shared ohmo session key lacks sender identity verification, enabling attackers to reuse another user's conversation state and interfere with their active tasks within the same session boundary.
CVSS v4.0
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in HKUDS OpenHarness affects versions prior to the PR #159 remediation and is classified as CWE-287 (Improper Authentication). The flaw is in the session key derivation mechanism used in shared chats or threads, where the ohmo session key is shared without verifying the sender's identity. This allows authenticated users within the same chat or thread to hijack other users' sessions by colliding into the same session boundary, effectively reusing conversation states and disrupting or replacing active tasks. The CVSS 4.0 base score is 5.3, indicating a medium severity with network attack vector, low complexity, and no user interaction required.
Potential Impact
An attacker who is an authenticated participant in a shared chat or thread can hijack other users' sessions by exploiting the shared session key that lacks sender identity verification. This can lead to unauthorized reuse of conversation states and interruption or replacement of active tasks of other users within the same session boundary. There is no indication of known exploits in the wild at this time.
Mitigation Recommendations
No official patch or remediation level has been published yet for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should be cautious when participating in shared chats or threads and consider limiting access to trusted participants only. Monitor vendor communications for updates regarding PR #159 or other official fixes.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-04-20T21:48:49.949Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e6a5a619fe3cd2cd37e7bb
Added to database: 4/20/2026, 10:16:06 PM
Last enriched: 4/28/2026, 6:04:49 AM
Last updated: 6/4/2026, 4:17:08 AM
Views: 67
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.