Lead · Vulnerabilities
The box you bought to hold the perimeter is now the way in, and this time the attacker didn't want your data
CISA put CVE-2026-123039 on the KEV list; the chain runs PHP2Shell for access, Gaia OS for root, a backdoor called TSGA for persistence, and a wiper for the ESXi hosts.
CISA added CVE-2026-123039 to the Known Exploited Vulnerabilities catalogue — an incorrect permission assignment for a critical resource affecting Check Point Firewall, Multi-Domain Security Management Server, Scalable Platforms, Security Gateway and Security Management Server, in the Gaia OS DynamicCLI component. The news cycle arrived 7.7 hours later, which is roughly how long it takes a Friday to become a weekend.
The shape of it, from the reporting: PHP2Shell gets initial access to unpatched Security Gateways, CVE-2026-123039 escalates to root, a previously unreported backdoor called TSGA settles in, and then the attackers wipe files on VMware ESXi hosts. Check Point has released emergency hotfixes and says exploitation has been running since late October. A Telegram exploit channel, which is not a source you'd stake a change window on, posted a link to a purported proof of concept and put the start date at 30 October.
Separately, and unproven as a link, an OTX writeup this morning describes adversaries systematically destroying a virtualisation estate over ten days: four ESXi hosts, every virtual machine, both vCenter Servers. That is not a ransom negotiation. That is somebody closing the business down and leaving the lights on, and it is the thing your backup strategy has been quietly promising to handle since 2019.
Why it mattersIf you run Check Point gateways, the hotfix is step one and hunting for TSGA and ESXi file destruction since 30 October is step two; a wiper doesn't give you a negotiation window.
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