PT-2026-115508 · Mattermost · Mattermost

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CVE-2026-18256

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Published

2026-10-16

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Updated

2026-10-16

CVSS v3.1

4.3

Medium

VectorAV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to properly restrict private teams from public team search results, which allows an authenticated user without permission to list private teams to disclose the ID, name, and display name of private teams via a modified team search request. Mattermost Advisory ID: MMSA-2026-00748

Fix

Incorrect Authorization

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Weakness Enumeration

Related Identifiers

CVE-2026-18256

Affected Products

Mattermost