CVE-2026-56696Public exploitNetwork attack vector

Persistent prompt injection via remote context commands

Published Jun 23, 2026 · Updated Jun 23, 2026

Prompt injection in OpenHarness 0.1.9 and earlier allows remote authenticated users to persist attacker-controlled agent context. The /issue and /pr_comments handlers inherit remote_invocable=True and write supplied Markdown to .openharness/issue.md and .openharness/pr_comments.md, which runtime prompt assembly later loads. Access requires admission by the configured remote channel policy; injected context can influence later local agent behavior but does not directly execute commands.

CVSS severity5.3
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prompt injection in OpenHarness 0.1.9 and earlier allows remote authenticated users to persist attacker-controlled agent context. The /issue and /pr_comments handlers inherit remote_invocable=True and write supplied Markdown to .openharness/issue.md and .openharness/pr_comments.md, which runtime prompt assembly later loads. Access requires admission by the configured remote channel policy; injected context can influence later local agent behavior but does not directly execute commands.

The record

CVE
CVE-2026-56696
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
Data Intelligence Lab @ HKU
Product
OpenHarness
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 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 <=0.1.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Data Intelligence Lab @ HKU · OpenHarnessversion=0 <=0.1.9

Published CVSS scores

5.4HKUDS OpenHarnessCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
5.3GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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