EGroupware Vulnerable to Local File Inclusion via file:// URI in Mail Compose
Summary
The function processes image URLs embedded in an HTML email body without validating or restricting URI schemes. The check !str_starts_with($myUrl, 'http') evaluates to true for file:// URIs, causing file_get_contents($basedir . urldecode($myUrl)) to read arbitrary files from the server filesystem and embed them as inline MIME attachments in outgoing email.
str_starts_with('file:///etc/passwd', 'http') → false !false → true
// api/src/Mail.php
foreach($images[2] as $i => $url)
{
//$isData = false;
$basedir = $data = '';
$needTempFile = true;
$attachmentData = ['name' => '', 'type' => '', 'file' => '', 'tmp_name' => ''];
try
{
// do not change urls for absolute images (thanks to corvuscorax)
if (!str_starts_with($url, 'data:'))
{
$attachmentData['name'] = basename($url); // need to resolve all sort of url
if (($directory = dirname($url)) == '.') $directory = '';
$ext = pathinfo($attachmentData['name'], PATHINFO_EXTENSION);
$attachmentData['type'] = MimeMagic::ext2mime($ext);
if ( strlen($directory) > 1 && !str_ends_with($directory, '/')) { $directory .= '/'; }
..
...
....
// processURL2InlineImages function
if ( $myUrl[0]!='/' && strlen($basedir) > 1 && !str_ends_with($basedir, '/')) { $basedir .= '/'; }
if ($needTempFile && empty($attachment) && !str_starts_with($myUrl, "http"))
{
try {
$data = file_get_contents($basedir.urldecode($myUrl));
}
catch (\Throwable $e) {
_egw_log_exception($e);
}
}
}
if (str_starts_with($url, 'data:'))PoC
- Log in as any authenticated EGroupware user with mail access and open the mail compose window.
- Switch to HTML body mode and insert:
<img src="file:///etc/passwd">. - The server executes file_get_contents('file:///etc/passwd'), writes the content to a temp file, and attaches it as an inline MIME part.
Impact
An authenticated attacker can read arbitrary files accessible by the web server process, including /etc/passwd, application configuration files containing database credentials, private TLS keys, and environment files.
Remediation
Enforce a strict URI scheme allowlist before calling file_get_contents(). Replace the check !str_starts_with($myUrl, 'http') with if (!preg_match('#^https?://#i', $myUrl)) { continue; } to reject file://, ftp://, php://, data://, and any other non-HTTP scheme.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | egroupware/egroupware | >= 26.0.20251208, < 26.5.20260507, < 23.1.20260601 | 26.5.20260507, 23.1.20260601 |
References
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-73- Platform
- Composer
- Package
egroupware/egroupware- Disclosed
- 07.07.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-c8m7-r2jv-rw63 - CC BY 4.0
Vulnerability history: egroupware/egroupware
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 7
- First → latest
- 05.2022 07.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 4
- Medium 2
Disclosures per year
- 2022: 2
- 2023: 0
- 2024: 1
- 2025: 0
- 2026: 4
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EGroupware Vulnerable to Local File Inclusion via file:// URI in Mail Compose this entry
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