CVE-2026-57921
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 improper access control allowed reading users' private data via the comment templates endpoint
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 confidenceThis is an improper access control vulnerability in JetBrains YouTrack where the comment templates endpoint allows unauthorized users to read private user data. The vulnerability stems from missing or insufficient authorization checks on the endpoint that handles comment templates, allowing attackers to access sensitive information they should not have permission to view.
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
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 checksWork through these to decide whether this CVE applies to you.
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Check installed YouTrack versionLog into YouTrack as an administrator and navigate to the Administration > System section to view the installed version number. Alternatively, check the build number in the YouTrack installation or startup logs.Affected if The installed version is lower than 2026.2.16593 (for example, 2026.2.16500 or earlier)
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Identify if comment templates functionality is in useCheck if any project in YouTrack has custom comment templates configured. This can be reviewed in project settings under the workflow or template configurations.Affected if Comment templates are configured and accessible within the YouTrack instance
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Verify access control on comment templates endpointAttempt to access the comment templates API endpoint using an account without administrative privileges, or review server access logs for requests to the comment templates endpoint originating from unauthorized user accounts.Affected if Non-privileged or unauthenticated users can successfully retrieve comment template data through the API
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Review audit logs for unauthorized access attemptsExamine YouTrack audit logs or server access logs for patterns of access to comment template-related endpoints from users who should not have permission to view private user data.Affected if Logs show requests to comment template endpoints from users lacking appropriate permissions
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Check user role assignments to comment template featuresIn Administration > Users and Groups, review which users or groups have been assigned roles that include access to comment templates or workflow features.Affected if Users without administrative rights have been granted access to comment template functionality
You are likely affected if your YouTrack version is below 2026.2.16593 and the comment templates endpoint is accessible to users who should not have permission to view private user data.
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. Review user access permissions and audit who has access to comment template endpoints as a precautionary measure.
2026.2.16593 or later
- Check current YouTrack version via Administration > Application section in the UI or via the API
- Perform a full backup of YouTrack data before upgrading
- Upgrade YouTrack to version 2026.2.16593 or later
- Verify the upgrade was successful and the vulnerability is resolved
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 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 $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-57921 — 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-2026-57921 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
- No spam, self-promotion, credentials, or personal data