VulnSocial

CVE-2026-3108Disclosure(mattermost / mattermost_server)

LOWCVSS 8.8 · HIGH

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 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to sanitize user-controlled post content in the mmctl commands terminal output which allows attackers to manipulate administrator terminals via crafted messages containing ANSI and OSC escape sequences that enable screen manipulation, fake prompts, and clipboard hijacking.. Mattermost Advisory ID: MMSA-2026-00599

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0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-150

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

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

What's happening

  • Technical details provided in 3 signals
  • Disclosure: 3 classified signals
  • Peaked at 2 mentions on most recent observed day (2026-03-28)
  • 3 total mentions across 2 days

Affected systems

Vendors
mattermost
Products
mattermost_server

1 version affected across 1 product

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-03-26: 1Mentions · 2026-03-28: 2Technical Details · 2026-03-26: 1Technical Details · 2026-03-28: 203-2603-28
Signal classification1 categories
Disclosure
3100.0%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-03-261
Disclosure1
2026-03-282
Disclosure2
Full discourse3 posts
  • CVE@CVEnew
    Disclosure

    CVE-2026-3108 Mattermost versions 11.2.x &lt;= 11.2.2, 10.11.x &lt;= 10.11.10, 11.4.x &lt;= 11.4.0, 11.3.x &lt;= 11.3.1 fail to sanitize user-controlled post content in the mmctl commands termin… https://www.cve.org/CVERecord?id=CVE-2026-3108

    Post summary

    Mattermost versions 10.11.x, 11.2.x, 11.3.x, and 11.4.x contain a sanitization flaw in mmctl commands that allows unsanitized user‑controlled content to be posted.

    00020338
    56.9K followersView on X
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-3108 Mattermost versions 11.2.x &lt;= 11.2.2, 10.11.x &lt;= 10.11.10, 11.4.x &lt;= 11.4.0, 11.3.x &lt;= 11.3.1 fail to sanitize user-controlled post content in the mmctl commands termin… https://www.cve.org/CVERecord?id=CVE-2026-3108 ----- Traducción: CVE-2026-3108 Mat… http://infoflow.cloud`

    Post summary

    Mattermost versions up to 11.2.2, 10.11.10, 11.4.0, and 11.3.1 have an input‑sanitization flaw in mmctl commands, as described in the CVE record.

    0000026
    65 followersView on X
  • The Hacker Wire@TheHackerWire
    Disclosure

    🟠 CVE-2026-3108 - High Mattermost versions 11.2.x &amp;lt;= 11.2.2, 10.11.x &amp;lt;= 10.11.10, 11.4.x &amp;lt;= 11.4.0, 11.3.x &amp;lt;= 11.3.1 fail to sanitize user-controlled post content in the mmctl commands terminal output wh... https://www.thehackerwire.com/vulnerability/CVE-2026-3108/ https://t.co/fyIVuXogvL

    Post summary

    The tweet announces CVE‑2026‑3108, noting that multiple Mattermost versions fail to sanitize user‑controlled post content in terminal output, and provides links to external reports but does not mention exploits or patches.

    0000038
    163 followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmattermostmattermost_server---
Appmattermostmattermost_server11.4.0--

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