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Mattermost ServerApplication · Mattermost

CVE-2023-46701

MEDIUM · 5.3 CVSS v3.1 Published 2023-12-12
Fix available
A fix is available. Upgrade to after 9.2.1 or later.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges 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 perform authorization checks in the /plugins/playbooks/api/v0/runs/add-to-timeline-dialog endpoint of the Playbooks plugin allowing an attacker to get limited information about a post if they know the post ID

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

The Playbooks plugin's /plugins/playbooks/api/v0/runs/add-to-timeline-dialog endpoint fails to validate user authorization before returning post information, allowing any authenticated user to query limited details about posts by knowing the post ID (an Insecure Direct Object Reference vulnerability).

MitigationApply the vendor patch for CVE-2023-46701 which adds proper authorization checks to verify the requesting user has permission to access the post before returning information.

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:<= 7.8.14>= 8.0.0, <= 8.1.5>= 9.0.0, <= 9.0.3>= 9.1.1, <= 9.1.2>= 9.2.0, <= 9.2.1

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
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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. Check Mattermost Server version
    Run `grep -i version /opt/mattermost/version.txt` or access the server diagnostics at /api/v4/system/stats or check the About section in the System Console
    Affected if The installed version falls within <= 7.8.14, >= 8.0.0 through <= 8.1.5, >= 9.0.0 through <= 9.0.3, >= 9.1.1 through <= 9.1.2, or >= 9.2.0 through <= 9.2.1
  2. Verify Playbooks plugin is enabled
    Navigate to System Console > Plugins > Plugin Management and confirm the 'Playbooks' plugin status, or query the API at /api/v4/plugins with admin credentials
    Affected if The Playbooks plugin is installed and enabled
  3. Confirm API endpoint exists
    Send an authenticated GET request to /plugins/playbooks/api/v0/runs/add-to-timeline-dialog with a valid post ID parameter
    Affected if The endpoint responds with post details without verifying the user has permission to access that post (returns 200 OK with post information rather than 403 Forbidden)

A user is affected if they run a vulnerable Mattermost Server version (within the ranges listed) AND have the Playbooks plugin enabled, allowing any authenticated user to query post details via the vulnerable endpoint without authorization checks.

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 a release after 9.2.1
Interim mitigation

Apply the vendor patch for CVE-2023-46701 which adds proper authorization checks to verify the requesting user has permission to access the post before returning information.

Recommended fix Moderate confidence

Upgrade to the latest version of Mattermost Server (recommended: 7.8.15, 8.1.6, 9.0.4, or 9.1.3 or later depending on your current major version)

  1. 1. Identify the current Mattermost Server version by navigating to System Console > About or checking the Mattermost logs
  2. 2. If running version <= 7.8.14, upgrade to version 7.8.15 or later
  3. 3. If running version >= 8.0.0 and <= 8.1.5, upgrade to version 8.1.6 or later
  4. 4. If running version >= 9.0.0 and <= 9.0.3, upgrade to version 9.0.4 or later
  5. 5. If running version >= 9.1.1 and <= 9.1.2, upgrade to version 9.1.3 or later
  6. 6. After upgrading, verify the Playbooks plugin is updated to a compatible version
  7. 7. Test the /plugins/playbooks/api/v0/runs/add-to-timeline-dialog endpoint to confirm authorization is now properly enforced

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
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.

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-2023-46701 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