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MattermostApplication

CVE-2023-4107

MEDIUM · 6.5 CVSS v3.1 Published 2023-08-11
Fix available
A fix is available. Upgrade to 7.8.8 / 7.9.6 or later.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Mattermost fails to properly validate the requesting user permissions when updating a system admin, allowing a user manager to update a system admin's details such as email, first name and last name.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Mattermost does not properly validate user permissions when updating system administrator accounts. A user with the user manager role can modify sensitive details of a system admin account (email, first name, last name) due to insufficient authorization checks, allowing privilege escalation.

MitigationApply the vendor patch that corrects the permission validation logic to ensure only users with appropriate system admin privileges can modify system administrator account details.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
MattermostApplication
Affected:>= 7.8.0, < 7.8.8>= 7.9.0, < 7.9.6>= 7.10.0, < 7.10.4

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the installed Mattermost version
    Run 'mattermost version' from the Mattermost server command line, or check the System Console > About page for the exact version number
    Affected if The version falls within >= 7.8.0 and < 7.8.8, OR >= 7.9.0 and < 7.9.6, OR >= 7.10.0 and < 7.10.4
  2. Determine if user manager roles are assigned
    Navigate to System Console > Users, or use the mmctl command 'mmctl user list --roles' to identify users granted the 'user_manager' role
    Affected if Any user account is assigned the user_manager role in the system
  3. Verify system administrator accounts exist
    Check System Console > Users and identify accounts with system_admin role, noting their email addresses and profile details
    Affected if There are one or more system administrator accounts in the deployment
  4. Confirm user manager can access admin account settings
    Log in with a user assigned the user_manager role and attempt to view or edit a system admin user's profile (email, first name, last name fields) in System Console > Users
    Affected if The user_manager role can modify sensitive fields on system admin accounts without receiving an authorization error

Your environment is affected if you run an affected Mattermost version AND have users with the user_manager role in a system that contains administrator accounts.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 7.8.8 / 7.9.6 / 7.10.4 or later
Fixed in 7.8.87.9.67.10.4
Interim mitigation

Apply the vendor patch that corrects the permission validation logic to ensure only users with appropriate system admin privileges can modify system administrator account details.

Recommended fix High confidence

Upgrade to Mattermost 7.8.8, 7.9.6, or 7.10.4 (preferably 7.10.4 for the latest stable release with all fixes)

  1. 1. Back up your Mattermost database and configuration files before proceeding with the upgrade
  2. 2. Download the appropriate Mattermost fixed version (7.8.8, 7.9.6, or 7.10.4) from the official Mattermost download page
  3. 3. Stop the Mattermost server to prevent active connections during the upgrade
  4. 4. Replace the existing Mattermost installation with the new version files
  5. 5. Restart the Mattermost server
  6. 6. Verify the upgrade was successful by checking the system console shows the new version number
  7. 7. Test that user management authorization controls are working correctly by attempting to update a system admin user (as a user manager, this should now be denied)
Caveat Review Mattermost release notes for your target version to check for any breaking changes or migration requirements between your current version and the target version

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Mattermost Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-4107 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data