Lead · Vulnerabilities
The security gateway was the way in, and the proof-of-concept is now public
CISA added Check Point's CVE-2026-123039 to KEV; within hours the press had it, and a working exploit was being passed around Telegram.
Here is the uncomfortable shape of it. Attackers got initial access to unpatched Check Point Security Gateways through the PHP2Shell flaws, then used CVE-2026-123039, an incorrect permission assignment in the Gaia OS, to become root, install a backdoor called TSGA, and wipe files on VMware ESXi hosts. Check Point has shipped emergency hotfixes and says exploitation has been going on since late October; one account puts the start of the attacks at 30 October. The device you bought so you would not have to think about the field behind it turned out to be the gate, the key and the man holding both.
The timing is the part defenders should sit with. CISA listed it on 13 November, the cyber-press carried it roughly eight hours later, and by that evening a Telegram exploit channel was linking a GitHub proof-of-concept for CVE-2026-123039. The catalogue entry is a public artefact. It tells your change advisory board that something is being exploited, and it tells everyone with a scanner and a weekend exactly which product to point it at, and only one of those two parties has a maintenance window.
Separately, an ESXi write-up published the same morning describes an estate taken apart over ten days: four ESXi hosts, both vCenter servers, every virtual machine. Nobody has tied that investigation to this campaign and we are not going to pretend otherwise. But if you run Check Point gateways, the honest order today is: apply the hotfixes, then go and look at your hypervisors, because the wiper is the bit that does not care whether you had backups of the backups.
Why it mattersPatch Gaia now, then hunt for TSGA and webshell persistence on gateways and check ESXi and vCenter for file destruction, because the exploit is no longer scarce.
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