CVE-2026-27823: EGroupware Remote Code Execution Vulnerability
Summary
CVE-2026-27823: EGroupware has a Remote Code Execution Vulnerability. Affects egroupware/egroupware across 2 version ranges.
< 23.1.20260224
>= 26.0.20251208, < 26.2.20260224
Fixed in 23.1.20260224 or 26.2.20260224, depending on the release line you run. How to fix ↓
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Background
EGroupware is an open-source groupware application that provides a suite of tools for collaboration, project management, and communication. It allows users to manage tasks, calendars, and documents efficiently. However, a critical vulnerability has been identified that exposes the application to remote code execution, potentially compromising the entire system.
Vulnerability Detail
A critical vulnerability in EGroupware allows an authenticated attacker to execute arbitrary commands on the server, leading to remote code execution (RCE). The vulnerability arises from improper authorization checks in the SmallPartMediaRecorder::ajax_upload() function, which allows attackers to bypass access controls. By manipulating request data, an attacker can upload malicious files to controllable paths, such as header.inc.php, and execute arbitrary code after a server restart or OPcache expiration. Additionally, an arbitrary file read vulnerability enables attackers to retrieve sensitive files, facilitating the exploitation process.
How To Fix
Fixed versions by release line
The minimum fixed version depends on the release line you run.
-
< 23.1.2026022423.1.20260224composer require egroupware/egroupware:23.1.20260224 -
>= 26.0.20251208, < 26.2.2026022426.2.20260224composer require egroupware/egroupware:26.2.20260224
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Workaround
If immediate patching is not possible, consider disabling user self-registration to mitigate the risk of exploitation. Additionally, restrict file upload permissions and monitor server logs for suspicious activities.
Conclusion
The CVE-2026-27823 vulnerability in EGroupware poses a significant risk of remote code execution due to improper authorization checks. It is crucial for users to update to the latest patched versions to protect their systems from potential exploitation. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2026-27823 is a critical vulnerability in EGroupware that allows remote code execution due to improper authorization checks.
You can check if your application is affected by using Vulert, which monitors open-source vulnerabilities in real-time. Visit Vulert Scanner to analyze your composer.lock file.
The vulnerability can lead to full system compromise, allowing attackers to execute arbitrary commands, read sensitive files, and modify system configurations.
Yes, disabling user self-registration and restricting file upload permissions can help mitigate the risk until the patch is applied.
The CVSS score for this vulnerability is 9.3, indicating a critical level of severity.
References
Related vulnerabilities
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