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Code With MeApplication · Jetbrains

CVE-2021-31900

MEDIUM · 5.3 CVSS v3.1 Published 2021-05-11
Fix available
A fix is available. Upgrade to 2021.1 or later.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

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 · unedited
In JetBrains Code With Me bundled to the compatible IDE versions before 2021.1, a client could open a browser on a host.

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 confidence

In JetBrains Code With Me (a collaborative coding plugin bundled with JetBrains IDEs), a client connected to a Code With Me session could open a browser on the host machine without proper authorization. This is an authorization bypass in the client-host communication, allowing a remote client to trigger browser actions on the host system.

MitigationUpgrade JetBrains IDEs with Code With Me to version 2021.1 or later, which contains the fix for this authorization issue.

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
Code With MeApplication
Affected:< 2021.1

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Check if Code With Me is enabled
    In your JetBrains IDE, go to Settings/Preferences > Plugins and look for the Code With Me plugin, or check the toolbar for the Code With Me icon indicating an active session
    Affected if Code With Me plugin is installed and enabled
  2. Identify the JetBrains IDE version
    In your JetBrains IDE, go to Help > About (or on macOS, JetBrains IDE > About) to display the exact version number (e.g., 2020.3, 2020.2, etc.)
    Affected if IDE version is displayed as a release prior to 2021.1 (such as 2020.3, 2020.2, 2020.1, etc.)
  3. Confirm Code With Me session status
    Check if there is an active Code With Me session running (look for the green headset icon in the IDE toolbar or check the Code With Me tool window)
    Affected if A Code With Me session is currently active with a remote client connected

Your environment is affected if you are running a JetBrains IDE version below 2021.1 with Code With Me plugin enabled and an active remote session, allowing unauthorized browser access on your host machine.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to 2021.1 or later
Fixed in 2021.1
Interim mitigation

Upgrade JetBrains IDEs with Code With Me to version 2021.1 or later, which contains the fix for this authorization issue.

Fix this in Code With Me Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-31900 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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