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CVE-2026-7184 Mattermost CVE debrief

CVE-2026-7184 is a medium-severity vulnerability in Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, and 10.11.x <= 10.11.15. The issue allows an attacker with the manage_secure_connections permission to obtain remote cluster authentication tokens via a PATCH request to the remote cluster endpoint due to a failure to sanitize the Remote Cluster API response on PATCH operations.

Vendor
Mattermost
Product
Unknown
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-18
Advisory published
2026-06-12
Advisory updated
2026-06-18

Who should care

Users of Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, and 10.11.x <= 10.11.15, especially those with the manage_secure_connections permission.

Technical summary

The vulnerability has a CVSS score of 6.5 and is classified as CWE-201. Mattermost has provided an advisory (MMSA-2026-00662) for this issue.

Defensive priority

Medium

Recommended defensive actions

  • Update to a patched version of Mattermost: 11.6.2 or later, 11.5.5 or later, and 10.11.16 or later.
  • Restrict the manage_secure_connections permission to only trusted users.

Evidence notes

The CVE was published and modified on 2026-06-12T17:16:27.530Z. The vendor is identified as Unknown Vendor with low confidence, but evidence suggests it is Mattermost.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-7184 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-7184

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-7184 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-7184

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.