ConfluenceApplication · Mattermost
CVE-2025-8285
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 check the access of the user to the channel which allows attackers to create channel subscription without proper access to the channel via API call to the create channel subscription endpoint.
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 authorization checks when creating channel subscriptions. The plugin fails to verify that the user requesting a subscription has legitimate access to the target channel, allowing any authenticated user to subscribe to channels they don't have permission to access via the create channel subscription API endpoint.
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
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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 checksWork through these to decide whether this CVE applies to you.
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Verify the Confluence plugin is installedIn Mattermost, navigate to System Console > Plugins > Plugin Management, or use the mmctl plugin list command if available, to confirm the Confluence plugin is present.Affected if The Confluence plugin is installed and enabled.
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Identify the installed plugin versionIn the plugin management interface, locate the version number listed for the Mattermost Confluence Plugin. This is typically displayed alongside the plugin name and status.Affected if The displayed version is a version number lower than 1.5.0.
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Confirm the version is within the affected rangeCompare your installed version against the affected range. Any version before 1.5.0 (including 1.4.0, 1.3.0, 1.2.0, etc.) is vulnerable.Affected if The version is less than 1.5.0, indicating the plugin lacks proper authorization checks.
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Audit recent channel subscriptions for unauthorized accessReview the channel subscription logs or audit records created by the Confluence plugin. Look for subscription events where the requesting user may not have had channel membership or access permissions.Affected if Subscriptions exist for channels the user normally would not have permission to access.
You are affected if the Mattermost Confluence Plugin is installed with a version lower than 1.5.0.
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 the Mattermost Confluence Plugin to version 1.5.0 or later, which implements proper channel access validation before allowing subscription creation.
1.5.0
- 1. Identify the currently installed Mattermost Confluence Plugin version
- 2. Upgrade the Mattermost Confluence Plugin to version 1.5.0 or later
- 3. Verify the upgrade was successful by checking the plugin version
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-2025-8285 — 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-2025-8285 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