CVE-2023-42793 — JetBrains
CRITICALCVE-2023-42793 is a critical-severity (CVSS 9.8) CWE-288 vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2023-10-04) and has been used in ransomware campaigns — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.
In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2023-10-04 — including use in ransomware campaigns. Federal agencies were required to remediate by 2023-10-25.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2023-42793.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2023-42793 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 394,803 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
Description
In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible
Affected Products
teamcityjetbrainsResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
JetBrains TeamCity 2023.05.3 - Remote Code Execution (RCE)
by ByteHunter · Mar 14, 2024
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2023-42793 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.
How to detect CVE-2023-42793
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2023-42793 -u https://target- Template
- JetBrains TeamCity < 2023.05.4 - Remote Code Execution
- Severity
- critical
- Impact
- Unauthenticated attackers can bypass authentication by creating admin tokens to gain full administrative access to TeamCity Server, potentially executing arbitrary code and compromising the entire CI/CD infrastructure and source code.
- Remediation
- Update JetBrains TeamCity to version 2023.05.4 or later that properly validates authentication and prevents token creation through unauthenticated requests.
Template by ProjectDiscovery nuclei-templates (iamnoooob, rootxharsh, pdresearch), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2023-42793 in your dependencies?
Find it across , including transitive dependencies.