# CVE-2026-27823: Remote Code Execution Vulnerability in EGroupware

> Authenticated attackers can achieve remote code execution via improper authorization and file primitives, potentially allowing unauthenticated access if self-registration is enabled.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 20 Jul 2026
- **Updated:** 21 Jul 2026
- **Also known as:** GHSA-h9qx-v5xp-ph8p

## What is CVE-2026-27823?

CVE-2026-27823 is a high-severity vulnerability in egroupware, published on 20 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability has been identified in EGroupware that may lead to Remote Code Execution (RCE). The issue allows an authenticated attacker to execute arbitrary commands on the server. If user self-registration is enabled, the vulnerability may be exploitable without prior authentication. The vulnerability stems from improper authorization checks combined with a file write primitive and an arbitrary file read vulnerability, which together enable full system compromise. This has been patched in versions 26.2.20260224 and 23.1.20260224.

Weakness: CWE-285 (Improper Authorization)

## Which versions are affected by CVE-2026-27823?

4 open source packages ship an affected version, including egroupware/egroupware.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `egroupware/egroupware` | Packagist | All versions | 23.1.20260224 |
| `egroupware/egroupware` | Packagist | All versions | 23.1.20260224 |
| `egroupware/egroupware` | Packagist | From 26.0.20251208 | 26.2.20260224 |
| `egroupware/egroupware` | Packagist | From 26.0.20251208 | 26.2.20260224 |

## How do I fix CVE-2026-27823?

Upgrade egroupware/egroupware to a fixed version for your release line: 23.1.20260224 or 26.2.20260224.

## Is CVE-2026-27823 being exploited?

There is no known exploitation of CVE-2026-27823 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27823 and fix it if it is affected.

What it is: CVE-2026-27823 is a high-severity vulnerability in egroupware, published on 20 Jul 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-2026-27823 in the wild and no public exploit code.

Affected packages and fixed versions:
- egroupware/egroupware (Packagist): affected all versions; fixed in 23.1.20260224
- egroupware/egroupware (Packagist): affected all versions; fixed in 23.1.20260224
- egroupware/egroupware (Packagist): affected from 26.0.20251208; fixed in 26.2.20260224
- egroupware/egroupware (Packagist): affected from 26.0.20251208; fixed in 26.2.20260224

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-2026-27823/ (Markdown: https://insights.sbomify.com/CVE-2026-27823/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27823
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27823
- OSV: https://osv.dev/vulnerability/CVE-2026-27823

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27823/
Summaries are generated and may contain mistakes; the official description above is the record.