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PatchSiren cyber security CVE debrief

CVE-2023-42793 JetBrains CVE debrief

CVE-2023-42793 affects JetBrains TeamCity and is described as an authentication bypass vulnerability. CISA added it to the Known Exploited Vulnerabilities catalog on 2023-10-04, indicating active exploitation concerns and known ransomware campaign use. For defenders, this is a high-priority CI/CD exposure because TeamCity often sits close to build systems, credentials, and release workflows.

Vendor
JetBrains
Product
TeamCity
CVSS
CRITICAL 9.8
CISA KEV
Listed
Original CVE published
2023-10-04
Original CVE updated
2023-10-04
Advisory published
2023-10-04
Advisory updated
2023-10-04

Who should care

Organizations running JetBrains TeamCity, especially on-premises deployments; CI/CD platform owners; security operations teams; and incident response teams tracking externally exposed build infrastructure.

Technical summary

The vulnerability is characterized by authentication bypass in JetBrains TeamCity. The supplied official records do not include exploit mechanics, but CISA’s KEV entry shows it was considered actively exploited and associated with known ransomware campaign use. The practical risk is unauthorized access to TeamCity instances and the systems or secrets they can reach.

Defensive priority

Critical. CISA KEV inclusion, same-day publication and KEV addition, and known ransomware campaign use all point to urgent remediation.

Recommended defensive actions

  • Apply vendor mitigations or update to the fixed TeamCity release referenced by JetBrains.
  • If mitigations are not available or cannot be applied quickly, discontinue use of the affected product until it can be secured.
  • Prioritize Internet-facing TeamCity instances and verify whether any deployments remain vulnerable.
  • Review TeamCity access logs, authentication events, and recent configuration or credential changes for signs of unauthorized activity.
  • Follow incident response procedures if the environment shows indicators of compromise or unexpected job, user, or token changes.

Evidence notes

CISA KEV lists JetBrains TeamCity Authentication Bypass Vulnerability, adds it on 2023-10-04, and marks known ransomware campaign use as Known. The KEV notes point to JetBrains’ vendor advisory and the NVD record. The CVE and timeline supplied here show publication and modification on 2023-10-04, which is the relevant issue date context.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-42793 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-42793

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2023-42793 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-42793

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.