CVE-2026-40874 | mailcow mailcow-dockerized prior 2026-03b Mail Service access control (GHSA-jjxh-rm7p-hjc3)

VDB-358589 · CVE-2026-40874 · GHSA-JJXH-RM7P-HJC3 MAILCOW MAILCOW-DOCKERIZED PRIOR 2026-03B MAIL SERVICE ACCESS CONTROL HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.2 $0-$5k 2.04+ Summaryinfo A vulnerability was found in mailcow mailcow-dockerized. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component Mail Service. The manipulation leads to access control. This vulnerability is traded as CVE-2026-40874. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised. Detailsinfo A vulnerability, which was classified as critical, has been found in mailcow mailcow-dockerized. This issue affects an unknown function of the component Mail Service. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is integrity, and availability. The summary by CVE is: mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, no administrator verification takes place when deleting Forwarding Hosts with `/api/v1/delete/fwdhost`. Any authenticated user can call this API. Checks are only applied for edit/add actions, but deletion can still significantly disrupt the mail service. Version 2026-03b fixes the vulnerability. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-40874 since 04/15/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue. 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: 5.4 VulDB Meta Temp Score: 5.2 VulDB Base Score: 5.4 VulDB Temp Score: 5.2 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: Access control CWE: CWE-284 / CWE-266 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-jjxh-rm7p-hjc3 Status: Confirmed CVE: CVE-2026-40874 (🔒) GCVE (CVE): GCVE-0-2026-40874 GCVE (VulDB): GCVE-100-358589 scip Labs: https://www.scip.ch/en/?labs.20171019 Entryinfo Created: 04/21/2026 22:35 Changes: 04/21/2026 22:35 (68) Complete: 🔍 Cache ID: 99:653:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸