EUVD-2026-66765
GHSA-68f6-q626-27mr
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/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
Network-accessible coerced NTLM auth requires only low privileges; scope changes because captured service account credentials enable compromise of systems beyond Veeam ONE.
Primary rating from Vendor (hackerone).
CVSS VectorVendor: hackerone
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability allowing a low-privileged user to capture the NTLM credentials of the Reporter service account.
AnalysisAI
NTLM credential capture in Veeam ONE exposes the Reporter service account to any low-privileged authenticated user over the network, enabling theft of service account credentials without user interaction. The captured Net-NTLMv2 hash can be relayed or cracked offline to compromise other systems in the environment, reflected by the high subsequent-system impact scores (SC:H/SI:H/SA:H) in the CVSS 4.0 vector. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid low-privileged account in the Veeam ONE environment, as confirmed by PR:L in the CVSS 4.0 vector; unauthenticated external attackers cannot directly exploit this vulnerability. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.5 accurately reflects a serious real-world risk profile: network-accessible (AV:N), low complexity (AC:L), no attack requirements (AT:N), low privileges required (PR:L), and no user interaction (UI:N) combine to make this broadly exploitable by any authenticated Veeam ONE user. … 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 | Consult the Veeam vendor advisory at https://www.veeam.com/kb4892 for patch availability and exact fix versions; no specific patched version number was provided in the available intelligence, so the advisory is the authoritative source. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Veeam ONE Reporter service accounts and restrict network access to the Reporter service to authorized backup administration networks via firewall rules; disable unnecessary local administrative accounts. …
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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.
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Same weakness CWE-522 – Insufficiently Protected Credentials
View allSame technique Information Disclosure
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External POC / Exploit Code
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