Vulnerability-Lookup

GHSA-HRC2-HCHG-RQ8R

Vulnerability from github – Published: 2026-03-17 15:36 – Updated: 2026-03-17 15:36

Details

A condition in ScreenConnect may allow an actor with access to server-level cryptographic material used for authentication to obtain unauthorized access, including elevated privileges, in certain scenarios.

Severity

9.0 (Critical)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-3564"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-17T15:16:19Z",
    "severity": "CRITICAL"
  },
  "details": "A condition in ScreenConnect may allow an actor with access to server-level cryptographic material used for authentication to obtain unauthorized access, including elevated privileges, in certain scenarios.",
  "id": "GHSA-hrc2-hchg-rq8r",
  "modified": "2026-03-17T15:36:23Z",
  "published": "2026-03-17T15:36:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3564"
    },
    {
      "type": "WEB",
      "url": "https://www.connectwise.com/company/trust/security-bulletins/2026-03-17-screenconnect-bulletin"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-3564 (GCVE-0-2026-3564)

Vulnerability from cvelistv5 – Published: 2026-03-17 14:48 – Updated: 2026-07-09 17:20

Title

ScreenConnect Instance Level Cryptographic Material Exposure

Summary

A condition in the ScreenConnect server component may allow an actor with access to server-level cryptographic material used for authentication to obtain unauthorized access, including elevated privileges, in certain scenarios. ScreenConnect host and guest client agents are not independently affected by this CVE.

Severity

9 (Critical)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-17 00:00 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

ConnectWise mitre root

References

1 reference

URL	Tags
https://www.connectwise.com/company/trust/securit…

Impacted products

1 product

Vendor	Product	Version
ConnectWise	ScreenConnect	Affected: All server versions prior to 26.1

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JSON

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              "content": {
                "id": "CVE-2026-3564",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-17T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2026-03-18T03:55:41.186Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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      "affected": [
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            "Server component",
            "Server authentication cryptographic material handling"
          ],
          "product": "ScreenConnect",
          "vendor": "ConnectWise",
          "versions": [
            {
              "status": "affected",
              "version": "All server versions prior to 26.1"
            }
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      "metrics": [
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
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            "userInteraction": "NONE",
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      "providerMetadata": {
        "dateUpdated": "2026-07-09T17:20:18.051Z",
        "orgId": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49",
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      "references": [
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      "solutions": [
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          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003e\u003cbr\u003e\u003c/p\u003e\n\n\u003cp\u003e\u003cb\u003eCloud:\u0026nbsp;\u003c/b\u003eNo action is required. ScreenConnect servers hosted in\n\u201cscreenconnect.com\u201d cloud (standalone and Automate/RMM integrated) or\n\u201chostedrmm.com\u201d for Automate partners have been updated to remediate the\nissue.\u202f\u0026nbsp;\u003c/p\u003e\n\n\u003cp\u003e\u003cb\u003eOn-premise\u003c/b\u003e\u0026nbsp;\u003cb\u003eScreenConnect\u003c/b\u003e \u003cb\u003ePartners:\u003c/b\u003e\u003c/p\u003e\n\n\n\n\u003cp\u003ePlease upgrade to ScreenConnect Server version 26.1. Visit \u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://www.screenconnect.com/download\"\u003eDownload\n| ScreenConnect\u003c/a\u003e page to download and apply the update \u003ci\u003e(access\nrequires a valid on-premises license)\u003c/i\u003e.\u0026nbsp;\u003c/p\u003e\n\n\n\n\u003cp\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eIf your license is out of maintenance, you must \u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://docs.connectwise.com/ScreenConnect_Documentation/On-premises/On-premises_licensing/Renew_or_upgrade_an_on-premises_license\"\u003eupgrade your license\u003c/a\u003e\u0026nbsp;before installing\nthe latest supported release of ScreenConnect. \u003c/li\u003e\u003cli\u003eFor\ninstructions on updating to the newest release, please reference this\ndoc: \u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://docs.connectwise.com/ConnectWise_ScreenConnect_Documentation/On-premises/Get_started_with_ConnectWise_ScreenConnect_On-Premise/Upgrade_an_on-premises_installation\"\u003eUpgrade an on-premise\ninstallation - ConnectWise\u003c/a\u003e\u0026nbsp;\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e\n\n\n\n\n\n\n\n\u003cp\u003e\u003cb\u003eAutomate On-Prem Partners with ScreenConnect\nIntegration\u003c/b\u003e:\u003c/p\u003e\n\n\u003cp\u003eFor partners using an on-premises ScreenConnect\ninstallation integrated with Automate, ScreenConnect 26.1 is available through\nthe \u003ca href=\"https://docs.connectwise.com/ConnectWise_Automate_Documentation/Automate_Product_Updates\"\u003eAutomate Product Updates\u003c/a\u003e page.\u003c/p\u003e\u003cp\u003e\u003cbr\u003e\u003c/p\u003e\n\n\u003cp\u003eLink to release\nnotes: \u003ca href=\"https://screenconnect.product.connectwise.com/communities/26/topics/5088-screenconnect-261\"\u003eScreenConnect 26.1 / ScreenConnect\u003c/a\u003e\u003c/p\u003e"
            }
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        }
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    "cveId": "CVE-2026-3564",
    "datePublished": "2026-03-17T14:48:59.940Z",
    "dateReserved": "2026-03-04T20:04:12.757Z",
    "dateUpdated": "2026-07-09T17:20:18.051Z",
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}

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-HRC2-HCHG-RQ8R

CVE-2026-3564 (GCVE-0-2026-3564)

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