CVE-2025-58084
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 Desktop App versions <= 5.13.0 fail to validate URLs external to the configured Mattermost servers, allowing an attacker on a server the user has configured to crash the user's application by sending the user a malformed URL.
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 confidenceThe Mattermost Desktop App versions 5.13.0 and earlier lack proper validation of URLs received from external sources. When a user is connected to a malicious or compromised Mattermost server, an attacker can send a crafted malformed URL that causes the desktop client to crash due to improper URL parsing or handling.
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< 5.13.1.0CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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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Check Mattermost Desktop App installed versionOpen the Mattermost Desktop App, go to Help > About Mattermost Desktop, or use the command line: mattermost-desktop --version (or check the executable file properties)Affected if The version displayed is 5.13.0 or earlier (any version below 5.13.1.0)
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Confirm version via system installed programsOn Windows, check Programs and Features or the registry. On macOS, check /Applications folder or use 'mdls' command. On Linux, check your package manager (dpkg, rpm, or flatpak list)Affected if The installed package version is less than 5.13.1.0
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Verify connection to Mattermost serverCheck the server URLs configured in the desktop app under Settings > General > Application Settings > Server URLsAffected if You are connected to any Mattermost server (the vulnerability triggers when receiving malformed URLs from the server, regardless of trust)
You are affected if your Mattermost Desktop App version is 5.13.0 or earlier (anything below 5.13.1.0), since the vulnerability exists in the URL parsing logic regardless of configuration.
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 · scoped5.13.1.0
Upgrade Mattermost Desktop App to a version newer than 5.13.0 when available. Until then, users should exercise caution when clicking links from untrusted or compromised Mattermost servers.
5.13.1.0
- Check the current Mattermost Desktop App version by going to Help > About Mattermost
- Navigate to the official Mattermost download page at mattermost.com/download
- Download the latest version (5.13.1.0 or later) for your operating system
- Run the installer and follow the prompts to update the application
- Restart the Mattermost Desktop App after the update completes
- Verify the update by checking Help > About Mattermost shows version 5.13.1.0 or higher
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-58084 — 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-2025-58084 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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- 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
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