CVE-2026-7184Network attack vector

Authentication-token disclosure via unsanitized PATCH response

Published Jun 12, 2026 · Updated Jun 12, 2026

Information disclosure in Mattermost allows remote authenticated users to obtain remote cluster authentication tokens via a PATCH request. In 10.11.0 through 10.11.15, 11.5.0 through 11.5.4, and 11.6.0 through 11.6.1, the Remote Cluster PATCH handler returns an unsanitized API response that retains the cluster's authentication token. An account with manage_secure_connections permission can send the request and recover credentials usable to authenticate a remote cluster; no token modification or service interruption is reported.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Mattermost allows remote authenticated users to obtain remote cluster authentication tokens via a PATCH request. In 10.11.0 through 10.11.15, 11.5.0 through 11.5.4, and 11.6.0 through 11.6.1, the Remote Cluster PATCH handler returns an unsanitized API response that retains the cluster's authentication token. An account with manage_secure_connections permission can send the request and recover credentials usable to authenticate a remote cluster; no token modification or service interruption is reported.

The record

CVE
CVE-2026-7184
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-201, T1552
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.11.0 <=10.11.15
  2. Affected versionversion=11.5.0 <=11.5.4
  3. Affected versionversion=11.6.0 <=11.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.11.0 <=10.11.15; version=11.5.0 <=11.5.4; version=11.6.0 <=11.6.1

Published CVSS scores

6.5Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-201Insertion of Sensitive Information Into Sent Data
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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