CVE-2025-3228Network attack vector

Guest Playbook access via missing requestor context

Published Jun 20, 2025 · Updated Jun 23, 2025

Incorrect authorization in affected Mattermost 9.11 and 10.5–10.8 releases allows remote authenticated users to read Playbook runs. The Playbooks handler fails to retrieve requestorInfo correctly for guest users, so its authorization decision lacks the guest's request context. Exploitation requires guest access and exposes Playbook-run information without reported modification or service interruption.

CVSS severity4.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in affected Mattermost 9.11 and 10.5–10.8 releases allows remote authenticated users to read Playbook runs. The Playbooks handler fails to retrieve requestorInfo correctly for guest users, so its authorization decision lacks the guest's request context. Exploitation requires guest access and exposes Playbook-run information without reported modification or service interruption.

The record

CVE
CVE-2025-3228
Published
Jun 20, 2025
Updated
Jun 23, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-863, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 2025Record 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=10.5.0 <=10.5.5
  2. Affected versionversion=10.6.0 <=10.6.5
  3. Affected versionversion=10.7.0 <=10.7.2
  4. Affected versionversion=10.8.0
  5. Affected versionversion=9.11.0 <=9.11.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.5.0 <=10.5.5; version=10.6.0 <=10.6.5; version=10.7.0 <=10.7.2; version=10.8.0; version=9.11.0 <=9.11.15

Published CVSS scores

4.3Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-863Incorrect Authorization
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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