ReservedCVE-2026-45016

    Egroupware: security vulnerability (CVE-2026-45016)

    Published Sources: OSV

    What is affected, what to do

    The available sources name no fixed version. Check the vendor guidance in the references below.

    Affected
    • Egroupware 26.0.20251208..*
    • Egroupware 26.0.20251216..*
    • Egroupware 26.0.20260108..*
    • Egroupware 26.0.20260113..*
    • Egroupware 26.0.20260123..*
    • Egroupware 26.1.20260130..*
    • Egroupware 26.2.20260203..*
    • Egroupware 26.2.20260207..*
    • Egroupware 26.2.20260209..*
    • Egroupware 26.2.20260216..*
    • Egroupware 26.2.20260224..*
    • Egroupware 26.3.20260316..*
    • Egroupware 26.4.20260408..*
    • Egroupware 26.4.20260413..*
    • Egroupware 26.4.20260423..*
    • Egroupware 26.4.20260424..*
    • Egroupware 26.4.20260429..*
    • Egroupware 26.5.20260506..*
    • Egroupware 14.2.20150121..*
    • Egroupware 14.2.20150206..*
    • Egroupware 14.2.20150210..*
    • Egroupware 14.2.20150212..*
    • Egroupware 14.2.20150218..*
    • Egroupware 14.2.20150310..*
    • Egroupware 14.2.20150402..*
    • Egroupware 14.2.20150421..*
    • Egroupware 14.2.20150428..*
    • Egroupware 14.2.20150429..*
    • Egroupware 14.2.20150501..*
    • Egroupware 14.2.20150603..*
    • Egroupware 14.2.20150707..*
    • Egroupware 14.2.20150717..*
    • Egroupware 14.3.20150728..*
    • Egroupware 14.3.20150729..*
    • Egroupware 14.3.20150811..*
    • Egroupware 14.3.20150821..*
    • Egroupware 14.3.20150826..*
    • Egroupware 14.3.20150908..*
    • Egroupware 14.3.20151012..*
    • Egroupware 14.3.20151027..*
    • Egroupware 14.3.20151028..*
    • Egroupware 14.3.20151029..*
    • Egroupware 14.3.20151030..*
    • Egroupware 14.3.20151110..*
    • Egroupware 14.3.20151130..*
    • Egroupware 14.3.20151201..*
    • Egroupware 14.3.20160112..*
    • Egroupware 14.3.20160113..*
    • Egroupware 14.3.20160304..*
    • Egroupware 14.3.20160428..*
    • Egroupware 14.3.20160512..*
    • Egroupware 14.3.20160522..*
    • Egroupware 14.3.20160524..*
    • Egroupware 14.3.20160525..*
    • Egroupware 14.3.20160708..*
    • Egroupware 16.1.20160603..*
    • Egroupware 16.1.20160621..*
    • Egroupware 16.1.20160627..*
    • Egroupware 16.1.20160630..*
    • Egroupware 16.1.20160708..*
    • Egroupware 16.1.20160715..*
    • Egroupware 16.1.20160801..*
    • Egroupware 16.1.20160810..*
    • Egroupware 16.1.20160905..*
    • Egroupware 16.1.20161006..*
    • Egroupware 16.1.20161102..*
    • Egroupware 16.1.20161107..*
    • Egroupware 16.1.20161208..*
    • Egroupware 16.1.20170118..*
    • Egroupware 16.1.20170203..*
    • Egroupware 16.1.20170315..*
    • Egroupware 16.1.20170415..*
    • Egroupware 16.1.20170612..*
    • Egroupware 16.1.20170613..*
    • Egroupware 16.1.20170703..*
    • Egroupware 16.1.20170922..*
    • Egroupware 16.1.20171106..*
    • Egroupware 16.1.20180116..*
    • Egroupware 16.1.20180130..*
    • Egroupware 17.1.20171023..*
    • Egroupware 17.1.20171106..*
    • Egroupware 17.1.20171115..*
    • Egroupware 17.1.20171129..*
    • Egroupware 17.1.20171130..*
    • Egroupware 17.1.20171218..*
    • Egroupware 17.1.20180118..*
    • Egroupware 17.1.20180130..*
    • Egroupware 17.1.20180209..*
    • Egroupware 17.1.20180321..*
    • Egroupware 17.1.20180413..*
    • Egroupware 17.1.20180523..*
    • Egroupware 17.1.20180625..*
    • Egroupware 17.1.20180720..*
    • Egroupware 17.1.20180831..*
    • Egroupware 17.1.20181018..*
    • Egroupware 17.1.20181204..*
    • Egroupware 17.1.20181205..*
    • Egroupware 17.1.20190111..*
    • Egroupware 17.1.20190214..*
    • Egroupware 17.1.20190222..*
    • Egroupware 17.1.20190402..*
    • Egroupware 17.1.20190529..*
    • Egroupware 17.1.20190808..*
    • Egroupware 19.1.20190716..*
    • Egroupware 19.1.20190717..*
    • Egroupware 19.1.20190726..*
    • Egroupware 19.1.20190806..*
    • Egroupware 19.1.20190813..*
    • Egroupware 19.1.20190822..*
    • Egroupware 19.1.20190917..*
    • Egroupware 19.1.20190925..*
    • Egroupware 19.1.20191031..*
    • Egroupware 19.1.20191119..*
    • Egroupware 19.1.20191220..*
    • Egroupware 19.1.20200130..*
    • Egroupware 19.1.20200318..*
    • Egroupware 19.1.20200409..*
    • Egroupware 19.1.20200430..*
    • Egroupware 19.1.20200605..*
    • Egroupware 19.1.20200701..*
    • Egroupware 20.1.20200525..*
    • Egroupware 20.1.20200613..*
    • Egroupware 20.1.20200628..*
    • Egroupware 20.1.20200710..*
    • Egroupware 20.1.20200716..*
    • Egroupware 20.1.20200728..*
    • Egroupware 20.1.20200731..*
    • Egroupware 20.1.20200810..*
    • Egroupware 20.1.20200812..*
    • Egroupware 20.1.20200818..*
    • Egroupware 20.1.20200901..*
    • Egroupware 20.1.20200914..*
    • Egroupware 20.1.20201005..*
    • Egroupware 20.1.20201020..*
    • Egroupware 20.1.20201028..*
    • Egroupware 20.1.20201202..*
    • Egroupware 20.1.20201217..*
    • Egroupware 20.1.20210125..*
    • Egroupware 20.1.20210324..*
    • Egroupware 20.1.20210503..*
    • Egroupware 21.1.20210318..*
    • Egroupware 21.1.20210329..*
    • Egroupware 21.1.20210406..*
    • Egroupware 21.1.20210420..*
    • Egroupware 21.1.20210504..*
    • Egroupware 21.1.20210521..*
    • Egroupware 21.1.20210629..*
    • Egroupware 21.1.20210723..*
    • Egroupware 21.1.20210923..*
    • Egroupware 21.1.20211130..*
    • Egroupware 21.1.20220207..*
    • Egroupware 21.1.20220406..*
    • Egroupware 21.1.20220408..*
    • Egroupware 21.1.20220905..*
    • Egroupware 21.1.20220916..*
    • Egroupware 21.1.20221202..*
    • Egroupware 21.1.20230210..*
    • Egroupware 22.1.20220920..*
    • Egroupware 23.1.20230110..*
    • Egroupware 23.1.20230114..*
    • Egroupware 23.1.20230125..*
    • Egroupware 23.1.20230210..*
    • Egroupware 23.1.20230228..*
    • Egroupware 23.1.20230314..*
    • Egroupware 23.1.20230328..*
    • Egroupware 23.1.20230412..*
    • Egroupware 23.1.20230428..*
    • Egroupware 23.1.20230503..*
    • Egroupware 23.1.20230524..*
    • Egroupware 23.1.20230620..*
    • Egroupware 23.1.20230726..*
    • Egroupware 23.1.20230728..*
    • Egroupware 23.1.20230824..*
    • Egroupware 23.1.20230911..*
    • Egroupware 23.1.20231110..*
    • Egroupware 23.1.20231122..*
    • Egroupware 23.1.20231129..*
    • Egroupware 23.1.20231201..*
    • Egroupware 23.1.20231219..*
    • Egroupware 23.1.20231220..*
    • Egroupware 23.1.20240125..*
    • Egroupware 23.1.20240304..*
    • Egroupware 23.1.20240430..*
    • Egroupware 23.1.20240624..*
    • Egroupware 23.1.20240905..*
    • Egroupware 23.1.20240930..*
    • Egroupware 23.1.20241008..*
    • Egroupware 23.1.20241111..*
    • Egroupware 23.1.20241128..*
    • Egroupware 23.1.20241214..*
    • Egroupware 23.1.20250113..*
    • Egroupware 23.1.20250307..*
    • Egroupware 23.1.20250416..*
    • Egroupware 23.1.20250506..*
    • Egroupware 23.1.20250715..*
    • Egroupware 23.1.20250902..*
    • Egroupware 23.1.20251021..*
    • Egroupware 23.1.20251119..*
    • Egroupware 23.1.20251222..*
    • Egroupware 23.1.20260108..*
    • Egroupware 23.1.20260113..*
    • Egroupware 23.1.20260131..*
    • Egroupware 23.1.20260224..*

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    —

    Priority

    No value is available for this vulnerability.

    —

    CVSS v3

    No value is available for this vulnerability.

    —

    EPSS score

    No value is available for this vulnerability.

    Show all metrics
    Severity
    Reserved
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    20.34 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    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

    1. Log in as any authenticated EGroupware user with mail access and open the mail compose window.
    2. Switch to HTML body mode and insert: <img src="file:///etc/passwd">.
    3. 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.

    Source: OSV (Open Source Vulnerabilities)

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    packagistegroupware/egroupware
    • 17.1.20180118
    • 14.3.20160304
    • 23.1.20251119
    • 14.3.20150826
    • 21.1.20210406
    • 26.0.20251216
    • 21.1.20230210
    • 26.2.20260209
    • 26.4.20260408
    • 19.1.20200409
    • 23.1.20230228
    • 20.1.20210503
    • 19.1.20191031
    • 16.1.20171106
    • 23.1.20230412
    • 20.1.20200901
    • 20.1.20210324
    • 17.1.20181205
    • 14.3.20160512
    • 21.1.20220916
    • 21.1.20210318
    • 23.1.20230524
    • 16.1.20160905
    • 14.2.20150603
    • 21.1.20210420
    • 23.1.20231219
    • 17.1.20181204
    • 16.1.20161208
    • 23.1.20230728
    • 20.1.20200613
    • 26.4.20260424
    • 26.4.20260423
    • 23.1.20231220
    • 14.2.20150501
    • 14.2.20150429
    • 26.2.20260203
    • 20.1.20210125
    • 23.1.20230503
    • 17.1.20180831
    • 16.1.20160603
    • 26.3.20260316
    • 14.3.20151201
    • 19.1.20191119
    • 17.1.20171023
    • 14.3.20160524
    • 23.1.20240930
    • 23.1.20240125
    • 20.1.20201028
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    References & sources

    • github.comEGroupware/egroupware/security/advisories/GHSA-c8m7-r2jv-rw63web
    • github.comEGroupware/egroupwarepackage
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    Badge preview for CVE-2026-45016
    <a href="https://intel.neosec.eu/en/cve/CVE-2026-45016"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-45016.svg?lang=en" alt="CVE-2026-45016 – NEOSEC Intel" height="20"></a>