CVE-2024-48872: Bypass of "Max failed attempts" restriction via race condition

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-12-16 · updated 2026-06-17
Weakness: CWE-362

Description

Mattermost versions 10.1.x <= 10.1.2, 10.0.x <= 10.0.2, 9.11.x <= 9.11.4, and 9.5.x <= 9.5.12 fail to prevent concurrently checking and updating the failed login attempts. which allows an attacker to bypass of "Max failed attempts" restriction and send a big number of login attempts before being blocked via simultaneously sending multiple login requests

Affected products

Mattermost: from 9.5.0 before 9.5.13; from 9.11.0 before 9.11.5; from 10.0.0 before 10.0.3; from 10.1.0 before 10.1.3 — fixed in 10.0.3, 10.1.3, 9.11.5, 9.5.13

How to fix

Upgrade to a fixed version: Mattermost 10.0.3, 10.1.3, 9.11.5, 9.5.13. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

Get alerted when CVE-2024-48872 or the next vulnerability affects your stack