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Known exploited vulnerability

CVE-2026-123039

highCVSS 3.1 7.8In CISA KEVEPSS 1.3%Published · checkpoint

The short answer

CVE-2026-123039 affects checkpoint Quantum Security Gateway and is rated high (CVSS 7.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-11-13: attackers are using it, so patch it first.

What it is

The Gaia OS DynamicCLI daemon runs as root and listens on a world-writable local socket (/tmp/dynamic_socket) without authenticating connecting processes. An authenticated local user can send a command to the socket and have it executed as root.

Weakness: CWE-732, CWE-862.

Severity

7.8 high

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploited (CISA KEV)

Yes, since Nov 13, 2026

Federal due date Nov 16, 2026

EPSS, next 30 days

1.3%

Higher than 70% of scored CVEs

How it can be exploited

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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…

Affected products

Quantum Security Gateway, Quantum Security Management. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-123039 being exploited?

Yes. CISA added CVE-2026-123039 to its Known Exploited Vulnerabilities catalog on 2026-11-13, with a federal remediation due date of 2026-11-16.

How do I fix CVE-2026-123039?

CISA's required action: 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Undergoing Analysis. The description is NVD's text, quoted as published.

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