Vulnerability · Published Apr 20, 2026 · Assigned by VulnCheck

CVE-2026-6729HKUDS OpenHarness Session Key Collision Privilege Escalation

Medium 6.3

In plain English

A medium-severity improper authentication in OpenHarness from HKUDS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.2%top 90.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
HKUDS	OpenHarness	0 – before PR #159

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

References

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