Dashboard / CVE-2026-18256

CVE-2026-18256

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 59/100
Published: 2026-10-16 Modified: 2026-10-29 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: Low
UI: None
S: Unchanged
C: Low
I: None
A: None

Description

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

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
mattermost mattermost_server 11.7.0 – 11.7.10
mattermost mattermost_server 11.10.0

References & Advisories (1)

Bug Bounty Relevance

59 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

4.3 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploitation Probability

0.16%
Raw Score 0.001620
Percentile 5.3%
Date 2026-10-29

Intelligence Sources

nvd ref →

External Links