CVE-2026-56696 (GCVE-0-2026-56696)

Vulnerability from cvelistv5 – Published: 2026-06-23 15:36 – Updated: 2026-06-23 15:46 X_Open Source
VLAI
Title
OpenHarness - Prompt Injection via /issue and /pr_comments Slash Commands
Summary
OpenHarness /issue and /pr_comments slash commands lack remote_invocable=False protection, allowing remote channel senders to write attacker-controlled Markdown into project context files. Admitted remote attackers can inject malicious content into .openharness/issue.md and .openharness/pr_comments.md files, which are subsequently injected into runtime system prompts, persistently influencing local agent behavior.
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
HKUDS OpenHarness Affected: 0 , ≤ 0.1.9 (semver)
Unaffected: 27bb93b810e9ea8fa4832eab7152eeb3b4a6bffb (git)
Create a notification for this product.
Date Public
2026-05-24 00:00
Credits
Chia Min Jun Lennon
Show details on NVD website
To clipboard 

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  "containers": {
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        "metrics": [
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              "content": {
                "id": "CVE-2026-56696",
                "options": [
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                  },
                  {
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-23T15:45:57.947347Z",
                "version": "2.0.3"
              },
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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              "exploit"
            ],
            "url": "https://github.com/HKUDS/OpenHarness/pull/272"
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        "title": "CISA ADP Vulnrichment"
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    ],
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        }
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            "Recovery": "NOT_DEFINED",
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            "attackRequirements": "NONE",
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            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
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            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-862",
              "description": "Missing Authorization",
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      "providerMetadata": {
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        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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        },
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    "cveId": "CVE-2026-56696",
    "datePublished": "2026-06-23T15:36:24.281Z",
    "dateReserved": "2026-06-22T17:09:16.556Z",
    "dateUpdated": "2026-06-23T15:46:02.247Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.