CVE-2024-27198
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 2023.11.4 authentication bypass allowing to perform admin actions was possible
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 confidenceAuthentication bypass vulnerability in JetBrains TeamCity versions prior to 2023.11.4 allows unauthenticated attackers to perform administrative actions by circumventing the authentication mechanism.
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< 2023.11.4CVSS 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 installed TeamCity versionAccess the TeamCity web interface and navigate to Administration > Server Administration > Server Information, or check the version banner on the login page. Alternatively, inspect the TeamCity installation directory for a version file or check the buildServer.properties configuration file.Affected if The installed version is any version prior to 2023.11.4 (for example, 2023.11.3, 2023.11.2, 2023.9.x, or older releases).
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Determine if TeamCity web interface is network-exposedReview network firewall rules, reverse proxy configurations, or cloud security group settings to determine whether the TeamCity HTTP port (default 8080 or 443 for HTTPS) is accessible from untrusted networks or the public internet.Affected if The TeamCity web interface is reachable from outside the trusted internal network without authentication barriers.
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Check for unauthorized administrative accountsIn the TeamCity web interface, go to Administration > Users and review the list of users with the System Administrator role. Look for unexpected or unknown accounts, particularly any created recently or with unfamiliar usernames.Affected if There are administrative accounts present that were not created by legitimate administrators.
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Audit recent server configuration changesIn the TeamCity web interface, navigate to Administration > Server Administration > Audit Log (or similar logging section) and review recent changes to server settings, VCS roots, build configurations, or user permissions for actions performed by unknown or system accounts.Affected if Configuration changes exist in the audit log that were not performed by known administrators, especially changes involving user creation, permission modifications, or sensitive settings.
You are affected if your TeamCity installation is version 2023.11.3 or earlier AND the web interface is accessible from untrusted networks, as the authentication bypass allows remote attackers to gain full administrative control without credentials.
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 · scoped2023.11.4
Upgrade TeamCity to version 2023.11.4 or later to remediate the authentication bypass. If immediate patching is not possible, restrict network access to the TeamCity server and monitor for unauthorized admin activity.
2023.11.4 or later
- 1. Back up your TeamCity data directory, database, and configuration files before upgrading
- 2. Download TeamCity 2023.11.4 or a later version from the official JetBrains website (www.jetbrains.com/teamcity/download)
- 3. Stop the TeamCity server and all related services
- 4. Follow the official TeamCity upgrade instructions: install the new version, ensuring the data directory points to your existing data
- 5. Start the TeamCity server and verify the application is running correctly
- 6. Confirm the authentication bypass is resolved by verifying admin actions require valid authentication
- 7. Review TeamCity logs for any unusual activity that may indicate exploitation attempts prior to patching
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,888.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-27198 — 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-2024-27198 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