Ransomware Gangs Exploited Critical VMware Flaw
CISA confirmed that attackers are weaponizing a critical VMware vulnerability to breach systems globally.
Updated on Sept. 27, 2026 in Cybersecurity
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Ransomware groups have been actively exploiting a critical directory traversal vulnerability in VMware vCenter, designated as CVE-2026-59310. The security flaw allows unauthenticated attackers to execute arbitrary code, compromising systems across 47 different countries.
Why it matters
Compromising virtualization platforms provides attackers with a high-value entry point, enabling them to gain administrative control over an organization's entire virtual infrastructure through a single intrusion.
The vulnerability allows attackers to install reverse SSH tools for persistent remote access after bypassing security via directory traversal. CISA has tracked 26 exploited VMware vulnerabilities over the past five years, with nine of those cases specifically tied to active ransomware campaigns.
The players
CISA
The Cybersecurity and Infrastructure Security Agency is the lead federal entity responsible for protecting critical infrastructure against digital threats.
Broadcom
Broadcom is a global technology company that owns and maintains the VMware virtualization software platform.
The details
Attackers leverage the flaw to gain persistent access, which ransomware operators use to compromise virtual environments. Broadcom issued a patch for the vCenter Syslog server on July 29, 2026, and federal agencies were mandated to secure their systems within three days of the vulnerability being added to the Known Exploited Vulnerabilities catalog.
Timeline
July 29, 2026: Broadcom released the patch for the VMware vCenter vulnerability.
August 2026: CISA added CVE-2026-59310 to its Known Exploited Vulnerabilities catalog.
September 2026: CISA confirmed that ransomware gangs are actively exploiting the flaw.
The Tech Race
This incident follows the precedent set by CISA's Known Exploited Vulnerabilities catalog, which mandates strict timelines for patching critical flaws that are actively weaponized by criminal groups. It highlights the escalating arms race where attackers prioritize virtualization platforms to maximize the scale of their ransomware deployments.
Organizations running unpatched VMware vCenter servers face immediate risks of unauthorized access and full-scale ransomware encryption. Administrators must verify their server versions against the July 2026 patch release to prevent persistent remote access by unauthorized actors.
The takeaway
Maintaining rigorous patching schedules for core infrastructure platforms is essential to preventing widespread network compromises. Network administrators should prioritize updating virtual server environments to eliminate entry points that allow for arbitrary code execution.
Further reading
For more information on threat mitigation, visit the Cybersecurity section.
Source note: This article includes information reported by Computer Crime Research Center.
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