VulnSocial

CVE-2026-24458Disclosure(mattermost / mattermost_server)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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

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0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-770

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • mattermost_server

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-03-16); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
mattermost
Products
mattermost_server

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-03-16: 1Mentions · 2026-03-24: 1Technical Details · 2026-03-16: 1Technical Details · 2026-03-24: 103-1603-24
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
Full discourse2 posts
  • PulsePatch.io@pulsepatchio
    Disclosure

    `Mattermost` deployments are vulnerable to CVE-2026-24458, which can lead to service disruption due to improper handling of very long passwords. Monitor official `Mattermost` channels for updates. #Mattermost #CVE #infosec https://www.pulsepatch.io/posts/cve-2026-24458-mattermost-password-handling

    Post summary

    The post announces that Mattermost deployments are vulnerable to CVE-2026-24458 because of improper handling of very long passwords, but provides no PoC, exploit, or patch details and does not report active exploitation.

    0000027
    2 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-24458 Mattermost versions 11.3.x &lt;= 11.3.0, 11.2.x &lt;= 11.2.2, 10.11.x &lt;= 10.11.10 fail to properly handle very long passwords, which allows an attacker to overload the serv… https://www.cve.org/CVERecord?id=CVE-2026-24458

    Post summary

    The text announces a vulnerability (CVE-2026-24458) where overly long passwords can cause server overload in Mattermost, but no PoC, exploit, patch, or evidence of active exploitation is provided.

    00000114
    56.7K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmattermostmattermost_server---

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