EUVD-2026-66760
GHSA-mffw-5w3v-pm66
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:L/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
Remote, unauthenticated, no-interaction coercion (AV:N/AC:L/PR:N/UI:N); credential leak enabling relay to other systems gives S:C and C:H, with only limited integrity (I:L) and no availability impact.
Primary rating from Vendor (hackerone).
CVSS VectorVendor: hackerone
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:L/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
Lifecycle Timeline
3DescriptionCVE.org
A vulnerability allowing an unauthenticated network attacker to coerce SMB authentication from the service account.
AnalysisAI
Authentication coercion in Veeam ONE lets an unauthenticated network attacker force the Veeam ONE service account to perform outbound SMB authentication to an attacker-chosen destination, exposing the account's NTLM credentials for capture and relay. The flaw (CWE-288, CVSS 4.0 base 9.3) is remotely triggerable with no privileges or user interaction and carries high subsequent-system impact, meaning captured service-account credentials can be relayed to pivot onto other systems. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network access to the Veeam ONE service endpoint that can be induced to perform outbound SMB authentication, plus an attacker-controlled SMB destination (rogue listener) to capture the coerced service-account authentication - no credentials or user interaction are needed (PR:N/UI:N/AT:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) describes a genuinely easy remote, unauthenticated, no-interaction trigger, and the score of 9.3 is driven by VC:H plus subsequent-system impact SC:H - reflecting that the real damage is credential capture and lateral movement, not local compromise of Veeam ONE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-provided update as described in Veeam KB4905 (https://www.veeam.com/kb4905) - Patch available per vendor advisory; the exact fixed version is not stated in the provided data and must be taken from that KB. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and document all Veeam ONE installations across your environment and assess their network accessibility and exposure; establish a vendor communication channel with Veeam to request patch timeline and interim guidance. …
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This vulnerability allows remote attackers to execute arbitrary code on affected installations of VEEAM One Agent 9.5.4.
This vulnerability allows remote attackers to execute arbitrary code on affected installations of VEEAM One Agent 9.5.4.
Incorrect access control in the component /api/user/manager of One v1.0 allows attackers to access sensitive information
Remote unauthenticated code execution in Veeam ONE (CPE cpe:2.3:a:veeam:one) allows attackers to run arbitrary code on t
A vulnerability in Veeam ONE allows an unauthenticated user to gain information about the SQL server connection Veeam ON
A vulnerability that allows an attacker in possession of the Veeam ONE Agent service account credentials to perform remo
An improper access control vulnerability allows low-privileged users to execute code with Administrator privileges remot
Unauthenticated arbitrary file read in Veeam ONE exposes sensitive server-side files to remote attackers without requiri
Remote code execution in Veeam ONE, the enterprise backup monitoring and analytics platform, is achievable by high-privi
NTLM credential capture in Veeam ONE exposes the Reporter service account to any low-privileged authenticated user over
SQL injection in Veeam ONE versions through 13.0.2 enables a low-privileged authenticated attacker to extract the full c
Veeam ONE's Reporter service exposes an improper privilege management flaw (CWE-269) that enables a locally authenticate
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External POC / Exploit Code
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