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MattermostApplication

CVE-2024-39832

HIGH · 8.7 CVSS v3.1 Published 2024-08-01
Fix available
A fix is available. Upgrade to 9.5.7 / 9.7.6 or later.
See remediation →
93/100
Remediation priority · Urgent
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 versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to properly safeguard an error handling which allows a malicious remote to permanently delete local data by abusing dangerous error handling, when share channels were enabled.

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 versions 9.5.x through 9.9.x contain improper error handling in the share channels feature that allows a remote attacker to permanently delete local data by exploiting dangerous error handling logic.

MitigationUpgrade to the latest patched version of Mattermost. As a workaround, disable the share channels feature until patching can be completed.

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:>= 9.5.0, < 9.5.7>= 9.7.0, < 9.7.6>= 9.8.0, < 9.8.2= 9.9.0

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
High
User interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/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. Determine installed Mattermost version
    Log into the Mattermost System Console and navigate to About > Mattermost, or use the Mattermost API endpoint /api/v4/system/platform
    Affected if Version falls within 9.5.0 to 9.5.6, 9.7.0 to 9.7.5, 9.8.0 to 9.8.1, or exactly 9.9.0
  2. Verify share channels feature status
    Navigate to Mattermost System Console > Site Configuration > Share Channels, or inspect the ShareChannelsEnabled setting in config.json
    Affected if The share channels feature is currently enabled
  3. Confirm external share channel links exist
    Check if any channels have external shares configured via the UI under Channel Menu > Share, or query the API endpoints related to channel sharing
    Affected if External share links have been created and exist in the system

You are affected if your Mattermost version is in the affected ranges AND the share channels feature is enabled, allowing a remote attacker to exploit dangerous error handling logic and permanently delete data.

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 9.5.7 / 9.7.6 / 9.8.2 or later
Fixed in 9.5.79.7.69.8.2
Interim mitigation

Upgrade to the latest patched version of Mattermost. As a workaround, disable the share channels feature until patching can be completed.

Recommended fix High confidence

Upgrade to the latest version in your current branch: 9.5.7 (for 9.5.x), 9.7.6 (for 9.7.x), 9.8.2 (for 9.8.x), or latest 9.9.x (9.9.1+) for 9.9.0 users

  1. Identify your current Mattermost version by checking the system console or running `mattermost version`
  2. Determine which version branch you are on (9.5.x, 9.7.x, 9.8.x, or 9.9.x)
  3. Download the appropriate fixed version: 9.5.7 for 9.5.x users, 9.7.6 for 9.7.x users, 9.8.2 for 9.8.x users, or the latest 9.9.x version (currently 9.9.1 or higher if available)
  4. Review the Mattermost upgrade guide at https://docs.mattermost.com/upgrade/upgrade-mattermost.html
  5. Backup your Mattermost database and configuration files before upgrading
  6. Stop the Mattermost server
  7. Install the new version using your deployment method (e.g., apt-get upgrade, Docker, or manual installation)
  8. Start the Mattermost server
Caveat Review Mattermost changelog for breaking changes between your current version and target version before upgrading

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

Fix this in Mattermost Scoped from the published advisory
  • Consultation3.0 h
  • Implementation12.0 h
  • Testing6.0 h
  • Review / QA3.0 h
24.0 hours of engineering $4,200
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,720.

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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-2024-39832 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