Known exploited vulnerability · CISA KEV

CVE-2026-123039: Check Point Multiple Products Incorrect Permission Assignment for Critical Resource Vulnerability

Check Point Firewall, Multi-Domain Security Management Server, Scalable Platforms, Security Gateway, and Security Management Server contain an incorrect permissions assignment for critical resources vulnerability when the Gaia OS DynamicCLI daemon runs as root and listens on a world-writable local socket without authenticating connecting processes. An authenticated local user can send a command to the socket and have it executed as root.

CVE-2026-123039

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2026-11-13: attackers are using it right now.

CISA KEV: Listed; Added 2026-11-13 · federal fix-by 2026-11-16
EPSS (30 days): 2.2%; Higher than 83% of CVEs · 2026-11-14
CVSS: No score

What CISA says

Check Point Multiple Products Incorrect Permission Assignment for Critical Resource Vulnerability

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

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CVE-2026-123039 in plain words

Written by Varaxon from the sources below. Last checked 13 November 2026.

What an attacker can do: On Check Point's Gaia OS, a helper process for the extended command line runs as root and listens on a local socket that any user on the system can write to, with no check on who is connecting. Any signed-in local user can send it a command and have it run as root. Check Point says the attacker must already be able to run code on the appliance, and that it has seen the flaw exploited against a couple of dozen customers.
Who is affected: Check Point Force Firewalls, Management and Log Servers, Multi-Domain Security Management and Multi-Domain Log Servers, and Maestro Orchestrators on R81, R81.10, R81.20, R82, R82.10 and R82.20. Check Point says Spark Firewalls and Smart-1 Cloud are not affected.
What to do first: Install the Jumbo Hotfix Accumulator that contains the fix: Take 174 or later for R81.20, Take 132 for R82, Take 52 for R82.10 and Take 14 for R82.20. Check Point lists no fixed take for R81 and R81.10, which it marks as end of support. Until the hotfix is on, the vendor's mitigation is to stop the dynamic_server process and keep it from restarting, which also turns off the Dynamic CLI commands. The advisory shows how to search /var/log/dynamicCli.log for signs of past use.

Sources we read

How to check if you are exposed to CVE-2026-123039

Find every Check Point Multiple Products system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2026-123039.

US federal agencies had to fix this by 2026-11-16. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Timeline

2026-11-13 · Added to CISA's Known Exploited Vulnerabilities catalog
2026-11-16 · Fix-by date for US federal agencies, still ahead

Vendor advisories and fixes

https://support.checkpoint.com/results/sk/sk1000362

Weakness type

More exploited Check Point vulnerabilities

CISA lists 6 exploited Check Point vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.11.13); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-14. This product uses the NVD API but is not endorsed or certified by the NVD.