2FA Bypass in Kaseya VSA <9.5.7
A critical vulnerability in Kaseya VSA versions prior to 9.5.7 allows attackers to bypass two-factor authentication (2FA). The flaw is due to 2FA enforcement being performed on the client side rather than the server side. During authentication, the server sends a response indicating whether 2FA is required. An attacker with valid credentials can intercept and modify this response (e.g., using Burp Suite) to set the MFARequired flag to False, thereby bypassing the 2FA prompt and gaining access.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
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.