CVE-2026-24458

CWE-770 — Allocation without Limits6 documents5 sources
Severity
7.5HIGH
EPSS
0.1%
top 82.62%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Github.com Mattermost/mattermost-serverGithub.com Mattermost/mattermost/server/v8Mattermost Mattermost Server+1 more
Timeline
PublishedMar 16
Latest updateMar 23

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly handle very long passwords, which allows an attacker to overload the server CPU and memory via executing login attempts with multi-megabyte passwords. Mattermost Advisory ID: MMSA-2026-00587

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages4 packages

▶NVDmattermost/mattermost_server10.11.0 — 10.11.11+2
▶Gogithub.com/mattermost/mattermost-server10.11.0-rc1 — 10.11.11+6
▶Gogithub.com/mattermost/mattermost/server/v8< 8.0.0-20260129164748-7201f42d955f
▶CVEListV5mattermost/mattermost11.3.0 — 11.3.0+2

🔴Vulnerability Details

4
OSV
Mattermost fails to properly handle very long passwords in github.com/mattermost/mattermost-server↗2026-03-23
▶
GHSA
Mattermost fails to properly handle very long passwords↗2026-03-16
▶
CVEList
DoS attack via login attempts with multi-megabyte passwords↗2026-03-16
▶
OSV
Mattermost fails to properly handle very long passwords↗2026-03-16
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-24458 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-24458 (HIGH CVSS 7.5) | Mattermost versions 11.3.x <= 11.3. | cvebase.io