VulnSocial

CVE-2026-28741Disclosure(mattermost / mattermost_server)

LOWCVSS 8.1 · 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 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625

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0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-352

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 2 signals
  • Disclosure: 2 classified signals
  • General: 1 classified signal
  • Peaked at 2 mentions on most recent observed day (2026-04-16)
  • 3 total mentions across 2 days

Affected systems

Vendors
mattermost
Products
mattermost_server

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-04-15: 1Mentions · 2026-04-16: 2Technical Details · 2026-04-16: 204-1504-16
Signal classification2 categories
Disclosure
266.7%
General
133.3%
Referenced assets4 URLs
Classification over time
DateTotalLabels
2026-04-151
General1
2026-04-162
Disclosure2
Full discourse3 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-28741 Mattermost versions 10.11.x &lt;= 10.11.12, 11.5.x &lt;= 11.5.0, 11.4.x &lt;= 11.4.2, 11.3.x &lt;= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows … https://www.cve.org/CVERecord?id=CVE-2026-28741 ----- Traducción: CVE-2026-28741 Ver… http://infoflow.cloud`

    Post summary

    The post announces CVE-2026-28741 as a CSRF token validation flaw impacting specific Mattermost releases, providing a link to the CVE record but no proof of exploit, tool, or patch information.

    0000031
    71 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-28741 Mattermost versions 10.11.x &lt;= 10.11.12, 11.5.x &lt;= 11.5.0, 11.4.x &lt;= 11.4.2, 11.3.x &lt;= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows … https://www.cve.org/CVERecord?id=CVE-2026-28741

    Post summary

    Mattermost versions 10.11.x through 11.3.2 contain a CSRF token validation flaw on an authentication endpoint, as documented in the CVE record.

    00000148
    57.2K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    General

    CVE-2026-28741 CSRF Token Validation Bypass in Mattermost Authentication Endpoint Multi... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-28741 Vulnerability Notification: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=3

    Post summary

    The tweet announces the existence of CVE-2026-28741, a CSRF token validation bypass in Mattermost, but provides no PoC, exploit code, active exploitation, patch information, or technical details.

    0000042
    4.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmattermostmattermost_server---

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