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CVE-2026-28759: mattermost server from 10.11.0 (inclusive), before 10.11.14 (exclusive), from 11.4.0 (inclusive), before 11.4.4…
CVE-2026-28759. CVSS 3.1 base score 4.3 (MEDIUM, Vendor/CNA). EPSS 0.00254 (percentile 0.15714), scored 13-Oct-2026.
Affected technology
mattermost server · from 10.11.0 (inclusive), before 10.11.14 (exclusive)
mattermost
mattermost server · from 11.4.0 (inclusive), before 11.4.4 (exclusive)
mattermost
mattermost server · from 11.5.0 (inclusive), before 11.5.2 (exclusive)
mattermost
Mattermost · 11.5.0 through 11.5.1, 10.11.0 through 10.11.13, 11.4.0 through 11.4.3
Mattermost
Description’s affected range: versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate that a remote cluster
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required
What an attacker can do
Vendor/CNA’s CVSS 3.1 assessment (base score 4.3/10) rates confidentiality and availability impact as none; integrity impact as low. The description does not specify what an attacker can achieve beyond these rated impacts.
- CWE
- CWE-863
- CCR priority
- 17.3 /100 (P5)
- CVSS 3.1
- 4.3 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N · Vendor/CNA
- EPSS
- 0.00254 · percentile 0.15714 · 2026-10-13
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-15 01:07:31.726917+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-28759.html