CVE-2026-40872 | mailcow mailcow-dockerized prior 2026-03b EMailAddress cross site scripting (GHSA-f9xf-vc72-rcgm)

VDB-358579 · CVE-2026-40872 · GHSA-F9XF-VC72-RCGM MAILCOW MAILCOW-DOCKERIZED PRIOR 2026-03B EMAILADDRESS CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.1 $0-$5k 2.55+ Summaryinfo A vulnerability marked as problematic has been reported in mailcow mailcow-dockerized. Affected by this issue is some unknown functionality. This manipulation of the argument EMailAddress causes cross site scripting. The identification of this vulnerability is CVE-2026-40872. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component. Detailsinfo A vulnerability classified as problematic was found in mailcow mailcow-dockerized. Affected by this vulnerability is an unknown code. The manipulation of the argument EMailAddress with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is: mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the admin dashboard's Autodiscover logs render the EMailAddress value (logged as the "user" field) without HTML escaping. By submitting an unauthenticated Autodiscover request with a crafted EMailAddress containing HTML/JS, the payload is stored in Redis and executed when an admin views the Autodiscover logs. Version 2026-03b fixes the vulnerability. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-40872 since 04/15/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK. Upgrading to version 2026-03b eliminates this vulnerability. Productinfo Type Virtualization Software Vendor mailcow Name mailcow-dockerized Website Product: https://github.com/mailcow/mailcow-dockerized/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 4.3 VulDB Meta Temp Score: 4.1 VulDB Base Score: 4.3 VulDB Temp Score: 4.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Cross site scripting CWE: CWE-79 / CWE-94 / CWE-74 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: mailcow-dockerized 2026-03b Timelineinfo 04/15/2026 CVE reserved 04/21/2026 +6 days Advisory disclosed 04/21/2026 +0 days VulDB entry created 04/21/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-f9xf-vc72-rcgm Status: Confirmed CVE: CVE-2026-40872 (🔒) GCVE (CVE): GCVE-0-2026-40872 GCVE (VulDB): GCVE-100-358579 scip Labs: https://www.scip.ch/en/?labs.20171019 Entryinfo Created: 04/21/2026 22:32 Changes: 04/21/2026 22:32 (68) Complete: 🔍 Cache ID: 99:FD4:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸