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CVE-2025-3928 is a critical vulnerability in Commvault Web Server affecting Windows and Linux deployments. The flaw is described as an unspecified issue that can be exploited by a remote, authenticated attacker to create and execute web shells on the web server. Reported impact also includes unauthorized access to customer Microsoft 365 environments in deployments using the Commvault Microsoft 365 backup service, indicating the vulnerability can be leveraged not only to compromise the Commvault web tier but also to abuse the platform’s access to protected cloud data and connected tenant resources. Fixed versions include 11.36.46, 11.32.89, 11.28.141, and 11.20.217.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
44 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Commvault vulnerability exploited as a zero-day to breach Commvault's Azure environment (nation-state attributed).
An (as-described) unspecified vulnerability in Commvault Web Server that was initially reported as exploited by Silk Typhoon for SaaS/trusted-relationship compromise leading to downstream customer access (including Microsoft 365 account compromise), but the specific reference was later removed from CrowdStrike’s post per the article.
A vulnerability affecting Commvault’s backup platform that Murky Panda (Silk Typhoon) has leveraged for initial access.
A known security flaw in Commvault that Murky Panda is reported to exploit as an infection/initial access pathway.
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.