CVE-2023-34228
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 TeamCity before 2023.05 authentication checks were missing – 2FA was not checked for some sensitive account actions
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 · high confidenceIn JetBrains TeamCity versions before 2023.05, authentication checks were missing for certain sensitive account actions – 2FA was not properly enforced even when enabled, allowing authenticated users with compromised credentials to perform sensitive operations without completing two-factor authentication.
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< 2023.05CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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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Identify installed TeamCity versionNavigate to the TeamCity administration dashboard, click 'About' in the bottom-left corner, or access the version via the server root URL (e.g., /about.html). The version number is displayed on the about page.Affected if The installed version is any release prior to 2023.05 (e.g., 2023.04.x, 2022.x, earlier releases).
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Verify 2FA status in authentication settingsLog in as an administrator, go to 'Administration' > 'Authentication' > 'User Management' settings, and check if Two-Factor Authentication (2FA) is enabled for the server or specific users.Affected if 2FA is enabled on the TeamCity server.
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Check authentication audit logs for sensitive actionsAccess 'Administration' > 'Audit' or 'Server Logs' and review logs for sensitive account operations such as user creation, role changes, project modifications, or API token generation. Look for entries where 2FA verification may not have been recorded.Affected if Sensitive account actions were performed by users who had 2FA enabled but no 2FA verification was logged or required.
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Review user authentication configurationExamine the authentication configuration files in the TeamCity data directory (typically under <TeamCity Data Directory>/config). Look for authentication settings that define whether 2FA is required for specific endpoints or operations.Affected if Authentication configuration does not enforce 2FA validation for sensitive operations even when 2FA is enabled for the user account.
You are affected if your TeamCity installation is version 2023.04 or earlier AND you have 2FA enabled, as sensitive account actions could bypass the 2FA requirement.
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 · scoped2023.05
Upgrade TeamCity to version 2023.05 or later where the missing 2FA authentication checks have been implemented. Verify that 2FA is properly enforced for sensitive account actions after the upgrade.
TeamCity 2023.05 or later
- 1. Back up your TeamCity database and configuration files before upgrading
- 2. Download TeamCity 2023.05 or later from the official JetBrains website
- 3. Stop the TeamCity server service
- 4. Install the upgrade following JetBrains upgrade documentation
- 5. Start the TeamCity server and verify all services are running
- 6. Test that 2FA is now properly enforced for sensitive account actions
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-34228 — 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-2023-34228 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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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.
- 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