CVE-2026-21668

HIGHNVD 8.88.8—

8.8

A vulnerability allowing an authenticated domain user to bypass restrictions and manipulate arbitrary files on a Backup Repository.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 10.9%
KEV: Not listed

Published

March 12, 2026

Last Modified

May 10, 2026

Advisory Details (1)

Auto-updated May 10, 2026

No patch confirmed yet.

generic

KB4830: Vulnerabilities Resolved in Veeam Backup & Replication 12.3.2.4465

https://www.veeam.com/kb4830

Data Freshness Timeline

(refreshed 18× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
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2026-05-28 13:44 UTCepss_batch
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2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
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2026-05-26 07:18 UTCepss_batch
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2026-05-26 07:18 UTCepss_batch
2026-05-22 21:16 UTCepss_batch
2026-05-21 22:43 UTCepss_batch

Frequently asked(5)

What is CVE-2026-21668?

CVE-2026-21668 is a high vulnerability published on March 12, 2026. A vulnerability allowing an authenticated domain user to bypass restrictions and manipulate arbitrary files on a Backup Repository.

When was CVE-2026-21668 disclosed?

CVE-2026-21668 was first published in the National Vulnerability Database on March 12, 2026, with the most recent update on May 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-21668 actively exploited?

CVE-2026-21668 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-21668?

CVE-2026-21668 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2026-21668?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21668, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-21668

📅 Published

🔄 Last Modified

📋 Advisory Details (1)