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CVE-2026-3637: mattermost server from 10.11.0 (inclusive), before 10.11.14 (exclusive), from 11.4.0 (inclusive), before 11.4.4…
CVE-2026-3637. CVSS 3.1 base score 4.3 (MEDIUM, Vendor/CNA). EPSS 0.00254 (percentile 0.15722), 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
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
An authenticated attacker with revoked posting privileges can modify their existing posts via direct API requests to the post update and patch endpoints. Vendor/CNA’s CVSS 3.1 assessment (base score 4.3/10) rates confidentiality and availability impact as none; integrity impact as low.
- CWE
- CWE-862
- 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 0.15722 · 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-2026-3637.html