CVE-2026-6729Network attack vector

Authenticated session hijacking via sender-agnostic keys

Published Apr 20, 2026 · Updated Apr 20, 2026

Improper authentication in OpenHarness before 0.1.7 allows remote authenticated users to hijack sessions in shared chats or threads. session_key_for_message omits sender_id and routes snapshot restoration and task interruption through a key shared by every participant in the chat or thread. Any allowed participant in that shared context can read prior conversation state and replace or interrupt another participant's active task.

CVSS severity5.3
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in OpenHarness before 0.1.7 allows remote authenticated users to hijack sessions in shared chats or threads. session_key_for_message omits sender_id and routes snapshot restoration and task interruption through a key shared by every participant in the chat or thread. Any allowed participant in that shared context can read prior conversation state and replace or interrupt another participant's active task.

The record

CVE
CVE-2026-6729
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
Data Intelligence Lab @ HKU
Product
OpenHarness
Classifications
CWE-287
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <PR #159

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Data Intelligence Lab @ HKU · OpenHarnessversion=0 <PR #159

Published CVSS scores

6.3VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
7.6NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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