What is CVE-2026-6729?

CVE-2026-6729 is a medium-severity vulnerability in Hkuds Openharness, classified under Improper Authentication. CVSS score: 6.3/10. Published 2026-04-20.

How severe is CVE-2026-6729?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Auth bypass in Hkuds Openharness

CVE-2026-6729

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 l…

Vulnerability class: Broken Authentication

EPSS: 0.000 (13.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

Hkuds Openharness — versions 0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

github.com/HKUDS/OpenHarness/pull/159 (patch)
github.com/HKUDS/OpenHarness/commit/3186851c479ee714a9bb9aa6cd77017db7e589e2 (patch)
www.vulncheck.com/advisories/hkuds-openharness-session-key-collision-privilege-… (third-party-advisory)

Frequently asked questions

What is CVE-2026-6729?: CVE-2026-6729 is a medium-severity vulnerability in Hkuds Openharness, classified under Improper Authentication. CVSS score: 6.3/10. Published 2026-04-20.
How severe is CVE-2026-6729?: Medium severity. CVSS v3 base score is 6.3 out of 10.