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Mattermost ServerApplication · Mattermost

CVE-2024-28053

MEDIUM · 6.5 CVSS v3.1 Published 2024-03-15
Fix available
A fix is available. Upgrade to 8.1.10 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
Resource Exhaustion in Mattermost Server versions 8.1.x before 8.1.10 fails to limit the size of the payload that can be read and parsed allowing an attacker to send a very large email payload and crash the server.

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 · high confidence

This is a resource exhaustion vulnerability in Mattermost Server versions 8.1.x before 8.1.10 where the email parsing functionality fails to enforce limits on payload size, allowing authenticated or unauthenticated attackers to send excessively large email payloads that consume server resources and cause a denial of service by crashing the server.

MitigationUpgrade to Mattermost Server version 8.1.10 or later which implements proper payload size limits for email processing.

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
Mattermost ServerApplication
Affected:>= 8.1.0, < 8.1.10

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
None
Availability
High

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

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 Mattermost Server version
    Run 'grep -i version /opt/mattermost/config/config.json' or check the system logs on startup, or use the Mattermost CLI: ./bin/mattermost version
    Affected if The version is 8.1.0 through 8.1.9 (any 8.1.x version below 8.1.10)
  2. Confirm email parsing is enabled
    Check the Mattermost config file at /opt/mattermost/config/config.json for 'EmailSettings' section. Look for 'EnableEmailBatching' or incoming email configurations. Also check if the 'email' service is listed as active in the system service status
    Affected if Email settings are enabled and the email service is active (email parsing is used for incoming email, email notifications, or email batching)
  3. Verify email endpoint exposure
    Review firewall rules and reverse proxy configurations to determine if the Mattermost email endpoints are accessible to unauthenticated attackers. Check if port 25 or the configured email port is exposed externally
    Affected if The email service ports or endpoints are accessible from external networks without authentication filtering

The server is affected if it runs Mattermost Server version 8.1.0-8.1.9 with email parsing functionality enabled or accessible, regardless of whether it is exposed to internal or external attackers.

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 8.1.10 or later
Fixed in 8.1.10
Interim mitigation

Upgrade to Mattermost Server version 8.1.10 or later which implements proper payload size limits for email processing.

Recommended fix High confidence

Mattermost Server 8.1.10 or later

  1. 1. Backup your Mattermost Server database and configuration files before proceeding.
  2. 2. Download Mattermost Server version 8.1.10 or later from the official Mattermost downloads page.
  3. 3. Stop the Mattermost Server service.
  4. 4. Upgrade the Mattermost Server installation using your package manager or by following the official upgrade documentation.
  5. 5. Verify the upgrade was successful by checking the server version in the system console.
  6. 6. Restart the Mattermost Server service.
  7. 7. Test that email functionality works correctly after the upgrade.

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

Fix this in Mattermost Server Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,390
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,224.

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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-2024-28053 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