CVE-2024-27198: JetBrains TeamCity Authentication Bypass Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 7 Mar 2024, 3 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 99.9%
EPSS score, percentile 100 of all scored records
- How severe?
- 9.8 Critical
CVSS v3.1 base score, given by the CNA
- What should I do?
Required action (CISA), due 28 Mar 2024: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected: before 2023.11.4
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date for this action: 28 March 2024.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
- https://www.jetbrains.com/help/teamcity/teamcity-2023-11-4-release-notes.html
- https://blog.jetbrains.com/teamcity/2024/03/additional-critical-security-issues-affecting-teamcity-on-premises-cve-2024-27198-and-cve-2024-27199-update-to-2023-11-4-now/
- https://nvd.nist.gov/vuln/detail/CVE-2024-27198
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | before 2023.11.4 |
Versions not listed are: unaffected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
JetBrains TeamCity contains an authentication bypass vulnerability that allows an attacker to perform admin actions.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2024-27198 to its Known Exploited Vulnerabilities (KEV) catalog on 7 Mar 2024.
- CISA marks it as known to be used in ransomware campaigns.
- The due date CISA sets for the required action is 28 Mar 2024.
- The CVE record was published on 4 Mar 2024, 3 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 99.9% (percentile 100), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
In JetBrains TeamCity before 2023.11.4 authentication bypass allowing to perform admin actions was possible
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 4 Mar 2024 | CVE record published |
| 7 Mar 2024 | Added to CISA KEV |
| 28 Mar 2024 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |
References
More exploited JetBrains vulnerabilities
- CVE-2026-63077: JetBrains TeamCity Deserialization of Untrusted Data Vulnerability
- CVE-2024-27199: JetBrains TeamCity Relative Path Traversal Vulnerability
- CVE-2023-42793: JetBrains TeamCity Authentication Bypass Vulnerability