cve.bz

CVE-2026-24458

7.5 highEPSS 0.3%

High (7.5) in mattermost mattermost server. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost/server/v8 8.0.0-20260129164748-7201f42d955f.

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

Severity

CVSS 3.1

7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-31)
CWE
CWE-770
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-m5rv-56xx-hfc6Gogithub.com/mattermost/mattermost/server/v8<8.0.0-20260129164748-7201f42d955f8.0.0-20260129164748-7201f42d955f
GHSA-m5rv-56xx-hfc6Gogithub.com/mattermost/mattermost-server<5.3.2-0.20260129164748-7201f42d955f5.3.2-0.20260129164748-7201f42d955f
GHSA-m5rv-56xx-hfc6Gogithub.com/mattermost/mattermost-server>=10.11.0-rc1 <10.11.1110.11.11
GHSA-m5rv-56xx-hfc6Gogithub.com/mattermost/mattermost-server>=11.2.0-rc1 <11.2.311.2.3
GHSA-m5rv-56xx-hfc6Gogithub.com/mattermost/mattermost-server>=11.3.0-rc1 <11.3.111.3.1
GO-2026-4731Gogithub.com/mattermost/mattermost-server>=10.11.0-rc1+incompatible <10.11.11+incompatible
>=11.2.0-rc1+incompatible <11.2.3+incompatible
>=11.3.0-rc1+incompatible <11.3.1+incompatible		10.11.11+incompatible, 11.2.3+incompatible, 11.3.1+incompatible
GO-2026-4731Gogithub.com/mattermost/mattermost-server/v5all versionsno fix published
GO-2026-4731Gogithub.com/mattermost/mattermost-server/v6all versionsno fix published
GO-2026-4731Gogithub.com/mattermost/mattermost/server/v8<8.0.0-20260129164748-7201f42d955f8.0.0-20260129164748-7201f42d955f

References

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