CVE-2026-6729
HKUDS OpenHarness Session Key Collision Privilege Escalation
Description
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.
INFO
Published Date :
April 20, 2026, 10:16 p.m.
Last Modified :
April 24, 2026, 7:14 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update OpenHarness to PR #159 or later.
- Ensure sender identity is verified for session keys.
- Implement stronger session key generation.
- Review chat and thread security settings.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-6729.
| URL | Resource |
|---|---|
| https://github.com/HKUDS/OpenHarness/commit/3186851c479ee714a9bb9aa6cd77017db7e589e2 | Patch |
| https://github.com/HKUDS/OpenHarness/pull/159 | Exploit Issue Tracking |
| https://www.vulncheck.com/advisories/hkuds-openharness-session-key-collision-privilege-escalation | Third Party Advisory |
| https://github.com/HKUDS/OpenHarness/pull/159 | Exploit Issue Tracking |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-6729 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-6729
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-6729 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-6729 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 24, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L Added CPE Configuration OR *cpe:2.3:a:hkuds:openharness:*:*:*:*:*:*:*:* versions up to (excluding) 0.1.7 Added Reference Type VulnCheck: https://github.com/HKUDS/OpenHarness/commit/3186851c479ee714a9bb9aa6cd77017db7e589e2 Types: Patch Added Reference Type CISA-ADP: https://github.com/HKUDS/OpenHarness/pull/159 Types: Exploit, Issue Tracking Added Reference Type VulnCheck: https://github.com/HKUDS/OpenHarness/pull/159 Types: Exploit, Issue Tracking Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/hkuds-openharness-session-key-collision-privilege-escalation Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 21, 2026
Action Type Old Value New Value Added Reference https://github.com/HKUDS/OpenHarness/pull/159 -
New CVE Received by [email protected]
Apr. 20, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L Added CWE CWE-287 Added Reference https://github.com/HKUDS/OpenHarness/commit/3186851c479ee714a9bb9aa6cd77017db7e589e2 Added Reference https://github.com/HKUDS/OpenHarness/pull/159 Added Reference https://www.vulncheck.com/advisories/hkuds-openharness-session-key-collision-privilege-escalation