October 'In Trend VM' Report: Exploited Windows ALPC and Check Point VPN Vulnerabilities

Positive Technologies has released its October edition of the 'In Trend VM' digest, highlighting two actively exploited vulnerabilities. The first is CVE-2026-85880, a local privilege escalation flaw in the Windows ALPC mechanism that was used as a zero-day in targeted attacks by multiple APT clusters. The second is CVE-2026-85102, a critical remote code execution vulnerability in Check Point Security Gateway and Spark Firewall products that affects VPN negotiation. Both issues have been added to CISA's KEV catalog, with public proof-of-concept code already available for the Check Point flaw. The report details attack chains, affected versions, and recommended patches or workarounds.

HabrOctober 27, 2026Translated from Russian

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Positive Technologies has published its October edition of the In Trend VM digest, focusing on two actively exploited vulnerabilities in Microsoft Windows and Check Point products.

The first vulnerability, tracked as PT-2026-88151 (CVE-2026-85880, CVSS 7.8), affects the ALPC inter-process communication mechanism in Windows. It allows an attacker running code inside an AppContainer sandbox to escape and escalate privileges to SYSTEM level without user interaction. Microsoft marked the issue as a zero-day, and CISA added it to the Known Exploited Vulnerabilities catalog on September 8.

Researchers from Proofpoint and Volexity linked the flaw to the BlueMoon attack chain that combined two Chrome V8 remote code execution vulnerabilities (CVE-2026-85046 and CVE-2026-87491) with CVE-2026-85880. Multiple clusters, including TA412 (also known as JungleBamboo, APT31, Violet Typhoon), UTA0560, UNK_LateNight, UNK_DoubleCheck, UNK_QuietRacket, and UTA0565, used the chain against U.S. nonprofits, mining companies, aerospace firms, and organizations in Indonesia and Singapore. Backdoors observed include GRIMWEDGE and ShadowPad.

The second vulnerability, PT-2026-88979 (CVE-2026-85102, CVSS 9.8), resides in Check Point Security Gateway and Spark Firewall devices. It stems from improper validation of X.509 certificates during VPN negotiation and allows unauthenticated remote attackers to execute arbitrary code with system privileges. Check Point began observing exploitation attempts on September 12, primarily targeting Spark Firewall customers, and CISA added the CVE to KEV on September 22. A public proof-of-concept exploit is available.

Affected systems include approximately 12,000 Check Point gateways with active VPN services exposed online. Patches were released on September 9 via LivePatch and Jumbo Hotfix Accumulator packages. Organizations unable to patch immediately are advised to restrict IKE and NAT-T traffic to trusted IP addresses for site-to-site VPNs.

Both vulnerabilities are now tracked in Positive Technologies' MaxPatrol VM vulnerability management platform within 12 hours of disclosure.

CISA CVE-2026-85880 CVE-2026-85102 ShadowPad ALPC

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