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CVE-2026-59309 is a critical authentication bypass vulnerability in VMware vCenter affecting the VMware Directory Service component, also referred to as vmdir. A remote, unauthenticated attacker with network access to a vulnerable vCenter instance can exploit the flaw to bypass normal authentication controls and obtain unauthorized access to the system. The issue affects VMware vCenter and related product lines that incorporate the vulnerable vCenter functionality, including VMware Cloud Foundation, VMware vSphere Foundation, VMware Telco Cloud Platform, and VMware Telco Cloud Infrastructure. Public reporting also indicates the flaw has been used in intrusion activity for early-stage reconnaissance and unauthorized administrative account creation on compromised vCenter environments.
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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.
79 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authentication bypass vulnerability in VMware Directory Service (vmdir) that was used alongside CVE-2026-59310 for early-stage reconnaissance and silent creation of administrative accounts within the vCenter environment.
An authentication bypass vulnerability affecting VMware vCenter that was also targeted in the same broader intrusion activity and was observed undergoing active scanning.
A critical authentication-bypass vulnerability affecting the VMware Directory Service in vCenter, disclosed alongside CVE-2026-59310.
Critical VMware vCenter authentication bypass vulnerability in the VMware Directory Service component allowing remote unauthenticated attackers to bypass authentication.
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.