Webex TeamsApplication · Cisco
CVE-2019-1939
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 · uneditedA vulnerability in the Cisco Webex Teams client for Windows could allow an unauthenticated, remote attacker to execute arbitrary commands on an affected system. This vulnerability is due to improper restrictions on software logging features used by the application on Windows operating systems. An attacker could exploit this vulnerability by convincing a targeted user to visit a website designed to submit malicious input to the affected application. A successful exploit could allow the attacker to cause the application to modify files and execute arbitrary commands on the system with the privileges of the targeted user.
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 confidenceA vulnerability in Cisco Webex Teams client for Windows allows unauthenticated remote attackers to execute arbitrary commands via malicious websites. The flaw stems from improper restrictions on software logging features on Windows, enabling the application to be manipulated into modifying files and executing commands with the targeted user's 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
Webex TeamsApplication
< 3.0.12427.0CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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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Confirm Cisco Webex Teams is installedOpen Windows Control Panel, go to Programs and Features, or run 'Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion' in PowerShell to list installed programsAffected if Cisco Webex Teams appears in the installed programs list
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Check installed version numberLocate the installed version by right-clicking the Webex Teams icon, selecting 'About Cisco Webex Teams', or checking the registry key under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall for the DisplayVersion valueAffected if Version displayed is lower than 3.0.12427.0
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Inspect Webex logging configurationNavigate to the Webex Teams data directory, typically found at %APPDATA%\Cisco\Spark or %LOCALAPPDATA%\Cisco\Spark, and examine any logging configuration files (such as config.json or logging.conf) for unrestricted write permissions or unusual settingsAffected if Logging configuration allows arbitrary file writes or command execution paths
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Review recent file activity in Webex directoriesUse Windows Explorer or PowerShell to check for recently created or modified files in %APPDATA%\Cisco\Spark and %LOCALAPPDATA%\Cisco\Spark directories, particularly looking for unexpected executable files or scriptsAffected if Unknown .exe, .bat, .ps1, or .cmd files exist in these directories with recent timestamps while the application was running
You are affected if Cisco Webex Teams for Windows is installed with a version number lower than 3.0.12427.0 and the logging feature is accessible to modify files on the system.
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.
From vendor data3.0.12427.0
Update Cisco Webex Teams client to the latest patched version. Until patched, advise users to avoid visiting untrusted websites while the application is running.
Fix this in Webex Teams
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 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 $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-1939 — 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-2019-1939 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