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CVE-2026-21668 is a high-severity restriction bypass vulnerability in the Backup Repository component of Veeam Backup & Replication. The flaw allows an authenticated domain user to bypass intended security restrictions and manipulate arbitrary files on the backup repository. The issue affects Veeam Backup & Replication 12.3.2.4165 and earlier releases in the 12.x branch, and is also referenced among vulnerabilities addressed in the 13.x branch prior to the fixed release. Based on the available information, the vulnerability enables unauthorized file operations within the repository context rather than direct code execution, creating a path to tamper with protected backup-related data and repository contents.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
High-severity vulnerability in the Veeam Backup & Replication Backup Repository component allowing an authenticated domain user to bypass security controls and manipulate arbitrary files.
A high-severity vulnerability in Veeam Backup & Replication that allows an authenticated domain user to bypass restrictions and manipulate arbitrary files in a Backup Repository.
A high-severity restriction bypass vulnerability in Veeam Backup & Replication that allows an authenticated domain user to manipulate arbitrary files on a Backup Repository.
A vulnerability in Veeam Backup & Replication that allows an authenticated domain user to bypass restrictions and manipulate arbitrary files on a Backup Repository.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.