CVE-2025-11776: mattermost server before 11.0.0 (exclusive); +1 more affected products

CVE-2025-11776. CVSS 3.1 base score 4.3 (MEDIUM, Vendor/CNA). EPSS 0.00208 (percentile 0.10191), scored 17-Oct-2026.

Affected technology

mattermost server · before 11.0.0 (exclusive)
mattermost

Mattermost · <11 through <11
Mattermost

Description’s affected range: versions <11 fail to properly restrict access to archived channel search API which

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

Guest users can discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint. Vendor/CNA’s CVSS 3.1 assessment (base score 4.3/10) rates confidentiality impact as low; integrity and availability impact as none.

Published 19-Oct-2026 14:02 UTC

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:L/I:N/A:N · Vendor/CNA
EPSS: 0.00208 · percentile 0.10191 · 2026-10-17
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-19 14:02:10.907757+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2025-11776.html