Vulnerability-Lookup

CVE-2026-40140 (GCVE-0-2026-40140)

Vulnerability from cvelistv5 – Published: 2026-07-06 16:13 – Updated: 2026-07-07 15:01

Title

High-Severity Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access

Summary

BeyondTrust Remote Support and Privileged Remote Access contain a high-severity pre-authentication vulnerability in the network communication subsystem. Insufficient validation of client-supplied input may allow an unauthenticated remote attacker to trigger a denial-of-service condition affecting appliance availability.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-06 18:55 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

BT mitre root

References

1 reference

URL	Tags
https://www.beyondtrust.com/trust-center/security…

Impacted products

2 products

Vendor	Product	Version	CPE status
BeyondTrust	Remote Support	Affected: 0 , ≤ 25.3.2 (custom)	guessed
BeyondTrust	Privileged Remote Access	Affected: 0 , ≤ 25.3.2 (custom)	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-40140

Vulnerability from fkie_nvd - Published: 2026-07-06 17:16 - Updated: 2026-07-07 18:40

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	13061848-ea10-403d-bd75-c83a022c2891	https://www.beyondtrust.com/trust-center/security-advisories/bt26-03	Vendor Advisory

Impacted products

	Vendor	Product	Version
	beyondtrust	privileged_remote_access	*
	beyondtrust	remote_support	*

JSON

To clipboard

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GHSA-8V46-5P7G-P46J

Vulnerability from github – Published: 2026-07-06 18:31 – Updated: 2026-07-07 21:31

Details

Severity

7.5 (High)


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

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

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    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-06T17:16:31Z",
    "severity": "HIGH"
  },
  "details": "BeyondTrust Remote Support and Privileged Remote Access contain a high-severity pre-authentication vulnerability in the network communication subsystem.\u00a0Insufficient validation of client-supplied input may allow an unauthenticated remote attacker to trigger a denial-of-service condition affecting appliance availability.",
  "id": "GHSA-8v46-5p7g-p46j",
  "modified": "2026-07-07T21:31:30Z",
  "published": "2026-07-06T18:31:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40140"
    },
    {
      "type": "WEB",
      "url": "https://www.beyondtrust.com/trust-center/security-advisories/bt26-03"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

NCSC-2026-0223

Vulnerability from csaf_ncscnl - Published: 2026-07-10 05:54 - Updated: 2026-07-10 05:54

Summary

Kwetsbaarheden verholpen in BeyondTrust Remote Support en Privileged Remote Access

Scope

4 vulnerabilities in this advisory, including CVE-2026-40140.

CVE-2026-40140

BeyondTrust Remote Support and Privileged Remote Access contain a high-severity pre-authentication vulnerability that enables unauthenticated remote attackers to cause denial-of-service via insufficient client input validation in the network communication subsystem.

7.5 (High)


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

Known affected: 2 products

Open the full advisory

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.

Detection rules are retrieved from Rulezet.

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.

Related by attack behaviour

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

CVE-2026-40140 (GCVE-0-2026-40140)

FKIE_CVE-2026-40140

GHSA-8V46-5P7G-P46J

NCSC-2026-0223

Tags

Sightings

Nomenclature

Related by attack behaviour