dbcve.org
Youtrack MobileApplication · Jetbrains

CVE-2021-43188

HIGH · 7.3 CVSS v3.1 Published 2021-11-09
Fix available
A fix is available. Upgrade to 2021.2 or later.
See remediation →
82/100
Remediation priority · High
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 YouTrack Mobile before 2021.2, access token protection on iOS is incomplete.

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 YouTrack Mobile before version 2021.2, access tokens stored on iOS devices were not properly protected, potentially allowing unauthorized access to user authentication credentials through the token.

MitigationUpdate YouTrack Mobile to version 2021.2 or later to obtain the token protection fix.

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
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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. Confirm YouTrack Mobile is installed on iOS
    Open the iOS device Settings app, scroll to 'General', tap 'iPhone Storage' (or 'iPad Storage'), and look for 'YouTrack Mobile' in the list of installed apps.
    Affected if YouTrack Mobile appears in the installed apps list on an iOS device.
  2. Locate the YouTrack Mobile version
    Open the iOS App Store, search for 'YouTrack Mobile', tap on the app, and scroll to the Version Information section. Alternatively, in iOS Settings > General > iPhone Storage, tap on YouTrack Mobile and view the app version shown.
    Affected if The displayed version number is visible and can be compared.
  3. Compare installed version to affected range
    Examine the version number found in the previous step. The affected range is any version prior to 2021.2 (for example, 2021.1.x, 2020.x, etc.).
    Affected if The installed version is below 2021.2 (for example, 2021.1, 2020.2, etc.).

A user is affected if YouTrack Mobile version 2021.1 or earlier is installed on an iOS device, as these versions contain improperly protected access tokens.

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

Update YouTrack Mobile to version 2021.2 or later to obtain the token protection fix.

Recommended fix Moderate confidence

2021.2

  1. Upgrade YouTrack Mobile to version 2021.2 or later
  2. Verify the upgrade was successful by checking the YouTrack Mobile version in the App Store or Google Play Store

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

Fix this in Youtrack Mobile Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
5.0 hours of engineering $860
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,376.

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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-2021-43188 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