EGroupware has a Remote Code Execution Vulnerability

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

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 · score source

EPSS

• CVE-2026-27823: 0.97% estimated exploitation activity in the next 30 days; percentile 62.14 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A critical 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. Details 1. Improper Authorization in SmallPartMediaRecorder::ajaxupload() The vulnerability originates in: EGroupware\SmallParT\Widgets\SmallPartMediaRecorder::ajaxupload() The function attempts to verify whether the current user is a teacher of the specified course ID before allowing a file upload. The critical authorization check ensures that the course access control list (ACL) contains: $requiredacl (self::ROLETEACHER, i.e., 3) However, the courseacl value is derived from user-controlled request…

Published by the source

7 Jul 2026, 13:01 UTC

Last modified by the source

7 Jul 2026, 13:01 UTC

Source last checked

26 Oct 2026, 14:50 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-h9qx-v5xp-ph8p

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-27823

Advisory: EGroupware has a Remote Code Execution Vulnerability
IDs: CVE-2026-27823, GHSA-h9qx-v5xp-ph8p
Record: https://patchnext.com/advisories/cve-2026-27823 (revision 1, source checked 26 Oct 2026, 14:50 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: egroupware/egroupware 26.2.20260224, 23.1.20260224. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist egroupware/egroupware: affected >= 26.0.20251208, < 26.2.20260224; < 23.1.20260224; fixed in 26.2.20260224, 23.1.20260224

## Suggested inspection (read-only)
- Packagist egroupware/egroupware: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on egroupware/egroupware.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-h9qx-v5xp-ph8p (GitHub-reviewed advisory GHSA-h9qx-v5xp-ph8p lists affected ranges: Packagist egroupware/egroupware >=26.0.20251208 =0 <23.1.20260224)

Commands are suggestions: review each one before running it.