CVE-2025-31947: mattermost server — Fix

Description

Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to lockout LDAP users following repeated login failures, which allows attackers to lock external LDAP accounts through repeated login failures through Mattermost.

Is your site exposed to CVE-2025-31947?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

5.8

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Weakness Type (CWE)

CWE-645 CWE-645

Affected Products

Vendor	Product	Versions
mattermost	mattermost_server	9.11.0 — 9.11.12
mattermost	mattermost_server	10.4.0 — 10.4.5
mattermost	mattermost_server	10.5.0 — 10.5.3
mattermost	mattermost_server	10.6.0 — 10.6.2

References

Advisories & Patches

https://mattermost.com/security-updates

Frequently Asked Questions

What is CVE-2025-31947? +

Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to lockout LDAP users following repeated login failures, which allows attackers to lock external LDAP accounts through repeated login failures through Mattermost. It has a CVSS v3.1 base score of 5.8 (MEDIUM).

How severe is CVE-2025-31947? +

CVE-2025-31947 has a CVSS v3.1 score of 5.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-31947? +

CVE-2025-31947 affects products from mattermost, specifically: mattermost_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-31947? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-53982 6.5

Cap-go Console < 12.28.2 contains a denial-of-service vulnerability in its account deletion flow that allows an attacker to block authentication …

CVE-2025-5241 5.3

Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series allows a remote unauthenticated attacker to lockout …

CVE-2024-37028 5.3

BIG-IP Next Central Manager may allow an attacker to lock out an account that has never been logged in. Note: …

CVE-2024-1722 3.7

A flaw was found in Keycloak. In certain conditions, this issue may allow a remote unauthenticated attacker to block other …

CVE-2025-12419 9.9

Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state …

CVE-2025-12421 9.9

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the …

CVE-2025-31947