VulnSocial

CVE-2026-10080Disclosure(mattermost / mattermost_server)

LOWCVSS 6.5 · MEDIUM

Signal is active with 2 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 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to validate WebSocket command field types which allows an authenticated user to crash the plugin process and deny service to all Boards users via a custom_focalboard_SUBSCRIBE_TEAM message with a non-string teamId.. Mattermost Advisory ID: MMSA-2026-00687

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0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-704

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

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 1 observed day

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • General: 1 classified signal
  • 2 total mentions across 1 day

Affected systems

Vendors
mattermost
Products
mattermost_server

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-08-18: 2Technical Details · 2026-08-18: 208-18
Signal classification2 categories
Disclosure
150.0%
General
150.0%
Referenced assets2 URLs
By indicator
Full discourse2 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-10080 Mattermost versions 11.7.x &lt;= 11.7.6, 10.11.x &lt;= 10.11.21, 11.8.x &lt;= 11.8.3 fails to validate WebSocket command field types which allows an authenticated user to cras… https://www.cve.org/CVERecord?id=CVE-2026-10080 ----- Traducción: CVE-2026-10080 Mat… https://infoflow.cloud`

    Post summary

    The tweet announces CVE-2026-10080, a vulnerability in Mattermost that lets authenticated users crash the system by exploiting a WebSocket command validation flaw, and links to the official CVE record.

    0000030
    100 followersView on X
  • CVE@CVEnew
    General

    CVE-2026-10080 Mattermost versions 11.7.x &lt;= 11.7.6, 10.11.x &lt;= 10.11.21, 11.8.x &lt;= 11.8.3 fails to validate WebSocket command field types which allows an authenticated user to cras… https://www.cve.org/CVERecord?id=CVE-2026-10080

    Post summary

    The text provides basic vulnerability details for CVE-2026-10080, noting that authenticated users can crash Mattermost by exploiting unvalidated WebSocket command field types, but offers no PoC, exploit code, or remediation information.

    000001.1K
    58.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmattermostmattermost_server---

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