dbcve.org
Youtrack MobileApplication · Jetbrains

CVE-2021-43191

MEDIUM · 5.3 CVSS v3.1 Published 2021-11-09
Fix available
A fix is available. Upgrade to 2021.2 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
JetBrains YouTrack Mobile before 2021.2, is missing the security screen on Android and iOS.

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

The YouTrack Mobile application for Android and iOS versions prior to 2021.2 lacks a security screen (lock screen or authentication prompt) when launching the app or returning from background. This allows unauthorized access to the application without authentication, potentially exposing sensitive project management data.

MitigationUpgrade YouTrack Mobile to version 2021.2 or later, which includes the missing security screen. If immediate upgrade is not possible, consider using device-level screen lock or MDM policies as an interim control.

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
Youtrack MobileApplication
Affected:< 2021.2

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. Identify if YouTrack Mobile is installed
    On Android: Navigate to Settings > Apps > Applications Manager and look for 'YouTrack Mobile'. On iOS: Navigate to Settings > General > iPhone Storage (or Settings > Apps on newer iOS) and look for 'YouTrack Mobile' in the app list.
    Affected if YouTrack Mobile application is present on the device
  2. Determine the installed YouTrack Mobile version
    On Android: Open the YouTrack Mobile app listing in the Play Store, or go to Settings > Apps > YouTrack Mobile > App info to view the version. On iOS: Open the App Store, tap your profile, tap Purchased, find YouTrack Mobile, and check the version; or view app details in Settings > General > iPhone Storage.
    Affected if Unable to determine the version number from app metadata or device settings
  3. Compare your version against the affected range
    Take the version number you obtained and compare it numerically to version 2021.2. Note that YouTrack Mobile versions prior to 2021.2 are affected; version 2021.2 and later include the security screen fix.
    Affected if Installed version is less than 2021.2 (for example, 2021.1, 2020.3, etc.)
  4. Verify if security screen is enabled (optional confirmation)
    Launch YouTrack Mobile and press the home button to send it to background, then immediately return to the app. Observe whether a lock screen, PIN prompt, or authentication screen appears before accessing the application.
    Affected if App returns to the main interface without any authentication prompt when restored from background

You are affected if YouTrack Mobile is installed and the version is below 2021.2, as this version range lacks the required security screen on launch and resume from background.

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.

dbcve · scoped
Upgrade available Upgrade to 2021.2 or later
Fixed in 2021.2
Interim mitigation

Upgrade YouTrack Mobile to version 2021.2 or later, which includes the missing security screen. If immediate upgrade is not possible, consider using device-level screen lock or MDM policies as an interim control.

Recommended fix Moderate confidence

2021.2

  1. Check the current installed version of YouTrack Mobile on the Android device or iOS device
  2. Open Google Play Store (Android) or App Store (iOS) on the device
  3. Search for "YouTrack Mobile" in the respective app store
  4. Locate the YouTrack Mobile application in the search results
  5. Tap the "Update" button to install version 2021.2 or later
  6. Verify the update was successful by checking the app version in the device's app settings or app store listing

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Youtrack Mobile Scoped from the published advisory
  • Consultation2.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,800
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,480.

Scan for this in your stack

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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-2021-43191 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