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

> Remote attackers can bypass authentication on GFI Archiver's MArc.Store service, potentially leading to code execution as SYSTEM.

- **Severity:** High 7.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Feb 2026
- **Updated:** 24 Feb 2026
- **Also known as:** GHSA-q8fp-vccx-9w2h

## What is CVE-2026-2039?

CVE-2026-2039 is a high-severity missing authorization vulnerability in GFI Archiver, published on 20 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-2039?

It affects 1 product.


Products: Gfi Archiver.

## How do I fix CVE-2026-2039?

No fix has been published for CVE-2026-2039 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2039 being exploited?

There is no known exploitation of CVE-2026-2039 in the wild and no public exploit code.

## Other vulnerabilities in GFI Archiver

- [CVE-2024-11948](https://insights.sbomify.com/CVE-2024-11948/): GFI Archiver Telerik Web UI Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2021-29281](https://insights.sbomify.com/CVE-2021-29281/): File upload in n/a (critical 9.8)
- [CVE-2026-2036](https://insights.sbomify.com/CVE-2026-2036/): GFI Archiver MArc.Store Deserialization of Untrusted Data Remote Code Execution Vulnerability (high 8.8)
- [CVE-2026-2037](https://insights.sbomify.com/CVE-2026-2037/): GFI Archiver MArc.Core Deserialization of Untrusted Data Remote Code Execution Vulnerability (high 8.8)
- [CVE-2024-11947](https://insights.sbomify.com/CVE-2024-11947/): GFI Archiver Core Service Deserialization of Untrusted Data Remote Code Execution Vulnerability (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2039 and fix it if it is affected.

What it is: CVE-2026-2039 is a high-severity missing authorization vulnerability in GFI Archiver, published on 20 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-2039 in the wild and no public exploit code.

Affected product: GFI Archiver. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-2039/ (Markdown: https://insights.sbomify.com/CVE-2026-2039/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2039
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2039
- OSV: https://osv.dev/vulnerability/CVE-2026-2039

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2039/
Summaries are generated and may contain mistakes; the official description above is the record.