CVE-2026-2039: GFI Archiver MArc.Store Missing Authorization Authentication Bypass Vulnerability

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-2039 is a critical-severity flaw (CVSS 9.8) affecting archiver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 t

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-02-20
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: gfi

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-20 23:16 UTCPublished CVE record published
2026-06-17 10:30 UTCUpdated Record last modified

gfi archiver DOWNGRADE

Affected: 15.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 15.10

1. Check installed version

apt-cache policy archiver || rpm -q archiver || archiver --version

2. No fixed release: DOWNGRADE to a release before 15.10 (Debian / Ubuntu)

apt-cache madison archiver sudo apt install archiver=<VERSION_BEFORE_15.10> sudo apt-mark hold archiver

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list archiver sudo dnf downgrade archiver-<VERSION_BEFORE_15.10> sudo dnf versionlock add archiver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-2039?

archiver: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-2039 being exploited?

CVE-2026-2039 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-2039 affect?

CVE-2026-2039 affects archiver. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2026-2039?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-2038 CRITICAL 9.8 DOWNGRADE GFI Archiver MArc.Core Missing Authorization Authentication Bypass Vulnerability
CVE-2026-2037 HIGH 8.8 DOWNGRADE GFI Archiver MArc.Core Deserialization of Untrusted Data Remote Code Execution Vulnerability
CVE-2026-2036 HIGH 8.8 DOWNGRADE GFI Archiver MArc.Store Deserialization of Untrusted Data Remote Code Execution Vulnerability
CVE-2024-11949 HIGH 8.8 UPGRADE GFI Archiver Store Service Deserialization of Untrusted Data Remote Code Execution Vulnerability
CVE-2024-11948 CRITICAL 9.8 UPGRADE GFI Archiver Telerik Web UI Remote Code Execution Vulnerability

References

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