# CVE-2026-27947: Group-Office Vulnerable to Remote Code Execution (RCE)

> Authenticated attackers can achieve remote code execution in Group-Office by exploiting command injection in TNEF attachment processing.

- **Severity:** Critical 9.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Feb 2026
- **Updated:** 3 Mar 2026
- **Also known as:** GHSA-2rwh-9qp7-f92x

## What is CVE-2026-27947?

CVE-2026-27947 is a critical command injection vulnerability in Intermesh groupoffice, published on 27 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Group-Office is an enterprise customer relationship management and groupware tool. Versions prior to 26.0.9, 25.0.87, and 6.8.154 have an authenticated Remote Code Execution vulnerability in the TNEF attachment processing flow. The vulnerable path extracts attacker-controlled files from `winmail.dat` and then invokes `zip` with a shell wildcard (`*`). Because extracted filenames are attacker-controlled, they can be interpreted as `zip` options and lead to arbitrary command execution. Versions 26.0.9, 25.0.87, and 6.8.154 fix the issue.

Weakness: CWE-88 (Improper Neutralization of Argument Delimiters in a Command), CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-27947?

It affects 1 product.


Products: Intermesh Group-Office.

## How do I fix CVE-2026-27947?

No fix has been published for CVE-2026-27947 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27947 being exploited?

There is no known exploitation of CVE-2026-27947 in the wild and no public exploit code.

## Other vulnerabilities in Intermesh groupoffice

- [CVE-2026-34838](https://insights.sbomify.com/CVE-2026-34838/): Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection` (critical 10.0)
- [CVE-2026-33755](https://insights.sbomify.com/CVE-2026-33755/): Authenticated SQL Injection in Contact/query addressBookIds filter (high 8.8)
- [CVE-2010-3428](https://insights.sbomify.com/CVE-2010-3428/): SQL injection in n/a (high 7.5)
- [CVE-2026-27832](https://insights.sbomify.com/CVE-2026-27832/): Group-Office Has Authenticated SQL Injection in advancedQueryData.comparator (high 7.1)
- [CVE-2025-48366](https://insights.sbomify.com/CVE-2025-48366/): GroupOffice's Blind Stored XSS in Phone Number Field Enables Forced Redirect and Unauthorized Actions (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27947 and fix it if it is affected.

What it is: CVE-2026-27947 is a critical command injection vulnerability in Intermesh groupoffice, published on 27 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-27947 in the wild and no public exploit code.

Affected product: Intermesh groupoffice. 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-2026-27947/ (Markdown: https://insights.sbomify.com/CVE-2026-27947/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27947
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27947
- OSV: https://osv.dev/vulnerability/CVE-2026-27947

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27947/
Summaries are generated and may contain mistakes; the official description above is the record.