ConfluenceApplication · Mattermost
CVE-2025-52931
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 · uneditedMattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to crash the plugin via constant hit to update channel subscription endpoint with an invalid request body.
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 confidenceThe Mattermost Confluence Plugin versions before 1.5.0 lacks proper input validation for request bodies on the update channel subscription endpoint. An unauthenticated or authenticated attacker can send malformed request bodies repeatedly to crash the plugin, resulting in denial of service.
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
ConfluenceApplication
< 1.5.0CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 checksWork through these to decide whether this CVE applies to you.
-
Check Mattermost Confluence Plugin versionNavigate to Mattermost System Console > Plugin Management > Confluence. Note the installed plugin version from the version field.Affected if The displayed version is lower than 1.5.0 (e.g., 1.4.0, 1.3.2, etc.)
-
Confirm plugin is enabledIn the same Plugin Management section, verify the Confluence plugin shows as Enabled/Active.Affected if The plugin is enabled and the version is below 1.5.0
-
Identify update channel subscription endpoint exposureReview the plugin configuration or API documentation to determine if the /update_channel_subscription endpoint is publicly or internally accessible. Check plugin settings for webhook/API routes.Affected if The endpoint is exposed and the plugin version is below 1.5.0
The environment is affected if the Mattermost Confluence Plugin is installed and enabled at a version lower than 1.5.0, with the update channel subscription endpoint accessible.
Generated from the published advisory. Verify against your own configuration.
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 · scoped1.5.0
Upgrade Mattermost Confluence Plugin to version 1.5.0 or later which implements proper request body validation.
1.5.0
- 1. Identify the current version of the Mattermost Confluence Plugin installed in your Mattermost instance
- 2. Navigate to Mattermost System Console > Plugins > Plugin Management
- 3. Locate the Confluence plugin and note the current version
- 4. Download Mattermost Confluence Plugin version 1.5.0 or later from the official Mattermost plugins marketplace or GitHub releases
- 5. In the Plugin Management page, click 'Upload Plugin' and select the version 1.5.0 plugin binary
- 6. Wait for the upload and installation to complete
- 7. Enable the plugin if it was previously enabled
- 8. Verify the installed version shows 1.5.0 or later in the Plugin Management console
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Confluence
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-52931 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-52931 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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