---
title: "CVE-2026-27823: EGroupware has a Remote Code Execution Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-27823/
description: "CVE-2026-27823 (egroupware/egroupware (Composer (PHP))): A vulnerability has been identified in EGroupware that may lead to Remote Code Execution (RCE). The…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-20
date_modified: 2026-07-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-27823"
kev: false
cvss: 8.7
epss: 0.00975
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-27823: EGroupware has a Remote Code Execution Vulnerability

**Signal:** Normal patch cycle. No exploitation signal; fix it in your next routine update if you are affected. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.0% , percentile 62: FIRST’s model estimates a 1.0% chance of exploitation activity in the next 30 days, higher than 62% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes egroupware/egroupware (Composer (PHP)) >= 26.0.20251208, < 26.2.20260224, fixed in 26.2.20260224 ; egroupware/egroupware (Composer (PHP)) < 23.1.20260224, fixed in 23.1.20260224 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Composer (PHP) `egroupware/egroupware` >= 26.0.20251208, < 26.2.20260224 → fixed: 26.2.20260224
- Composer (PHP) `egroupware/egroupware` < 23.1.20260224 → fixed: 23.1.20260224

## Affected products (CVE record)

- EGroupware egroupware: <= 26.2.20260216, <= 23.1.20260131

## Severity

- GitHub_M CVSS 4.0: 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`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.97% probability of exploitation activity in the next 30 days; percentile 62.

## Sources

- [GitHub Advisory GHSA-h9qx-v5xp-ph8p](https://github.com/advisories/GHSA-h9qx-v5xp-ph8p)
- [CVE.org record CVE-2026-27823](https://www.cve.org/CVERecord?id=CVE-2026-27823)
- [NVD entry CVE-2026-27823](https://nvd.nist.gov/vuln/detail/CVE-2026-27823)
- [github.com](https://github.com/EGroupware/egroupware/security/advisories/GHSA-h9qx-v5xp-ph8p)

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Source page: https://erroneo.us/security/cve/CVE-2026-27823/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt