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CVE

CVE-2026-24458

Mattermost fails to properly handle very long passwords
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CVE

CVE-2026-24458

Mattermost fails to properly handle very long passwords

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

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Related Resources

No items found.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-24458, https://github.com/mattermost/mattermost/commit/7201f42d955f1bc44719b862132546626b60a180, https://github.com/mattermost/mattermost, https://mattermost.com/security-updates

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00063%
EPSS Percentile
0.19567%
Introduced Version
0,v11.4.0-rc1+incompatible,v11.3.0-rc1+incompatible,v11.0.0-alpha.1+incompatible,v8.0.0-20250911144334-c28d13cbc9a6,v8.0.0+incompatible,v8.0.0-20230418053528-b200a078819e,v6.3.0,v6.0.0-20210722065147-c4b4e1bc38eb,v6.0.0,v5.0.0-rc1,v5.0.0-20191128133938-2259b7f2a8b9,v4.5.0-rc1+incompatible,v0.0.0-20171120170404-d1cee022471f,v3.2.0+incompatible,v0.0.0-20160706225454-683f7133190a
Fix Available
8.0.0-20260129164748-7201f42d955f,5.3.2-0.20260129164748-7201f42d955f,v11.4.0-rc3+incompatible,v11.3.1+incompatible,v11.2.3+incompatible,v8.0.0-20260127065329-0655a6335460,v10.11.11-rc1+incompatible

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