Is CVE-2026-40874 actively exploited?

No active exploitation of CVE-2026-40874 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40874 be exploited remotely?

Yes. CVE-2026-40874 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40874?

CVE-2026-40874 has a CVSS score of 6.0 (MEDIUM).

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MEDIUM

CVE-2026-40874

CWE-284Published: April 21, 2026· Updated: Apr 22, 2026

6.0

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.6th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-40874 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges Req.Low

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X