Veeam Backup Replication
CVE-2026-21668
HIGH
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability allowing an authenticated domain user to bypass restrictions and manipulate arbitrary files on a Backup Repository.
AnalysisAI
Authenticated domain users can bypass file access restrictions on Backup Repository systems to read, modify, or delete arbitrary files due to insufficient authorization controls. This high-severity flaw affects users with valid domain credentials and requires no user interaction to exploit. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Authenticated domain user account with network access to Backup Repository. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker (requires authentication) could exploit this vulnerability to compromise the affected system. |
| Remediation | Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all backup repository instances and document current access controls; audit recent backup modification logs for suspicious activity. …
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External POC / Exploit Code
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