What is the CVSS score of CVE-2026-2039?

CVE-2026-2039 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.6%.

Which versions of Archiver are affected by CVE-2026-2039?

A critical authentication bypass vulnerability (CVE-2026-2039) affecting GFI Archiver allows remote attackers to gain unauthorized access to systems without valid credentials.

How to fix or mitigate CVE-2026-2039?

Within 24 hours: Inventory all GFI Archiver deployments and isolate affected systems from untrusted networks; notify your incident response team and legal/compliance. Within 7 days: Implement network segmentation restricting MArc.Store access to authorized IPs only; enable enhanced logging and monitoring for unauthorized access attempts; begin vendor communication for patch timeline. Within 30 days: Deploy compensating controls (WAF rules, reverse proxy authentication); evaluate alternative archiving solutions; conduct forensic audit for evidence of exploitation.

Archiver CVE-2026-2039

CRITICAL

Missing Authorization (CWE-862)

2026-02-20 zdi-disclosures@trendmicro.com

Authentication Bypass Archiver

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

CVE Published

Feb 20, 2026 - 23:16 nvd

CRITICAL 9.8

DescriptionCVE.org

GFI Archiver MArc.Store Missing Authorization Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of GFI Archiver. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the configuration of the MArc.Store.Remoting.exe process, which listens on port 8018. The issue results from the lack of authorization prior to allowing access to functionality. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of SYSTEM. Was ZDI-CAN-28597.