CVE-2026-57926
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 · uneditedIn JetBrains YouTrack before 2026.2.16593 the websandbox bridge was vulnerable to a prototype pollution attack
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 confidenceA prototype pollution vulnerability exists in the websandbox bridge component of JetBrains YouTrack versions prior to 2026.2.16593. This JavaScript vulnerability allows attackers to modify object prototypes, potentially enabling security boundary bypasses or arbitrary code execution within the websandbox context.
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< 2026.2.16593CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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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Identify YouTrack versionLocate the installed YouTrack version number in the administration interface under 'About' or 'System Info', or check the version file in the YouTrack installation directoryAffected if The version displayed is lower than 2026.2.16593 (for example, 2026.2.16500 or any 2026.x version prior to 2026.2.16593)
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Confirm websandbox component is presentVerify that the websandbox bridge component is included in the YouTrack installation by examining the installed modules or checking the application components listAffected if The websandbox component is present in the installation
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Check websandbox accessibilityDetermine if the websandbox functionality is exposed or accessible by reviewing the application URL paths (typically /websandbox/*) or checking network exposure settingsAffected if The websandbox endpoint is accessible from the network or from untrusted input sources
You are affected if YouTrack version is below 2026.2.16593 AND the websandbox component is installed and accessible in your environment.
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 · scoped2026.2.16593
Upgrade YouTrack to version 2026.2.16593 or later. If immediate patching is not feasible, consider restricting access to the websandbox functionality until the upgrade can be applied.
2026.2.16593
- 1. Back up your YouTrack database and configuration files before starting the upgrade process.
- 2. Download YouTrack version 2026.2.16593 or later from the official JetBrains website (www.jetbrains.com/youtrack).
- 3. Stop the YouTrack service on your server.
- 4. Run the installer or deploy the new version following JetBrains standard upgrade procedures.
- 5. Start the YouTrack service after the upgrade completes.
- 6. Verify that the websandbox bridge is functioning correctly and the prototype pollution vulnerability is resolved.
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,760.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-57926 — 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-2026-57926 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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