CVE-2026-24458

published 2026-03-16

CVE-2026-24458: 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…

Priority P3 42 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

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

Affected

14 ranges

Vendor	Product	Version range	Fixed in
github.com	mattermost_mattermost-server	>= 0 < 5.3.2-0.20260129164748-7201f42d955f	5.3.2-0.20260129164748-7201f42d955f
github.com	mattermost_mattermost-server	>= 10.11.0-rc1 < 10.11.11	10.11.11
github.com	mattermost_mattermost-server	>= 10.11.0-rc1+incompatible < 10.11.11+incompatible	10.11.11+incompatible
github.com	mattermost_mattermost-server	>= 11.2.0-rc1 < 11.2.3	11.2.3
github.com	mattermost_mattermost-server	>= 11.2.0-rc1+incompatible < 11.2.3+incompatible	11.2.3+incompatible
github.com	mattermost_mattermost-server	>= 11.3.0-rc1 < 11.3.1	11.3.1
github.com	mattermost_mattermost-server	>= 11.3.0-rc1+incompatible < 11.3.1+incompatible	11.3.1+incompatible
github.com	mattermost_mattermost_server_v8	>= 0 < 8.0.0-20260129164748-7201f42d955f	8.0.0-20260129164748-7201f42d955f
mattermost	mattermost	10.11.0 – 10.11.10	—
mattermost	mattermost	11.2.0 – 11.2.2	—
mattermost	mattermost	11.3.0 – 11.3.0	—
mattermost	mattermost_server	>= 10.11.0 < 10.11.11	10.11.11
mattermost	mattermost_server	>= 11.2.0 < 11.2.3	11.2.3
mattermost	mattermost_server	>= 11.3.0 < 11.3.1	11.3.1

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-770