Is CVE-2026-28732 actively exploited?

No active exploitation of CVE-2026-28732 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-28732 be exploited remotely?

Yes. CVE-2026-28732 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-28732?

CVE-2026-28732 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-28732

CWE-863Published: May 18, 2026· Updated: May 19, 2026

4.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.0th

Official Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to enforce slash command trigger-word uniqueness during command updates which allows an authenticated team member with Manage Own Slash Commands permission to hijack and impersonate existing system or custom slash commands via editing their own slash command trigger to an already-registered trigger through the command update API. Mattermost Advisory ID: MMSA-2026-00597

NVD Source

Technical Analysis

CVE-2026-28732 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.