CVE-2025-21083
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 Mobile Apps versions <=2.22.0 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.
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 confidenceMattermost Mobile Apps versions 2.22.0 and earlier fail to properly validate post props, allowing an authenticated malicious user to craft a specially formatted post that causes the mobile application to crash. This is a denial-of-service vulnerability requiring user authentication but no elevated privileges.
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< 2.23.0CVSS 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
- 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 checksWork through these to decide whether this CVE applies to you.
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Identify Mattermost Mobile app usageCheck if Mattermost Mobile app (iOS or Android) is installed on any mobile devices in your organizationAffected if Mattermost Mobile app is deployed on any mobile devices
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Check iOS app versionOpen the App Store, search for Mattermost, and note the version number shown under the app name. Alternatively, open the app, go to Settings > About > VersionAffected if Installed version is 2.22.0 or earlier (any version below 2.23.0)
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Check Android app versionOpen Google Play Store, search for Mattermost, and note the version number shown. Alternatively, open device Settings > Apps > Mattermost > App info to view the versionAffected if Installed version is 2.22.0 or earlier (any version below 2.23.0)
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Verify authentication contextDetermine whether mobile app users have active authentication sessions (valid login credentials) to your Mattermost serverAffected if Any users with active sessions are using the vulnerable app version
A user is affected if they have Mattermost Mobile app version 2.22.0 or earlier installed and are authenticated to a Mattermost server, as the specially crafted post could be sent to their device.
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 · scoped2.23.0
Upgrade Mattermost Mobile Apps to a version newer than 2.22.0 where proper post props validation is implemented.
Mattermost Mobile version 2.23.0 or later
- Open the app store on your mobile device (Apple App Store for iOS or Google Play Store for Android)
- Search for 'Mattermost' or locate the Mattermost app in your installed apps
- Update Mattermost Mobile to version 2.23.0 or later
- Alternatively, uninstall and reinstall the app from the app store to ensure you have the latest version
- After updating, verify the app launches without crashing
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 h
- Testing2.0 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 $1,376.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-21083 — 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-2025-21083 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