Exploited CVEs / CVE-2023-42793
CVE-2023-42793
JetBrains TeamCity Authentication Bypass Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2023-10-25 (that deadline has passed); treat that date as the outer bound for your own environment. Check the vendor security advisory for the fix.
Risk summary
Actively exploited JetBrains TeamCity vulnerability, Critical severity, CVSS v3 9.8. Added to the CISA KEV catalog 2023-10-04.
Senserva AI Opinion for CVE-2023-42793
JetBrains TeamCity servers can be taken over outright through this authentication bypass, which yields remote code execution and scores Critical (CVSS 9.8) with 100% EPSS and known ransomware use. A CI/CD server is a supply chain in a box: it holds source code, signing secrets, and deployment credentials, so a compromised TeamCity instance can poison everything it builds. Exploitation was confirmed within days of disclosure in October 2023.
Do this: Patch or take offline every TeamCity server today, then rotate the credentials and tokens it stored.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2023-42793
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Updated August 29, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Full tracking and change history for CVE-2023-42793
- Published
- 2023-10-04
- Last revised
- 2023-10-04
- Changes tracked
- 1
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
- 2023-10-04 added to the CISA KEV catalog by CISA
- 2026-07-17 CVSS 0.0 to 9.8; EPSS first scored at 100.0%
Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.
CISA required action
Federal (BOD 22-01) remediation due date: 2023-10-25 (past due).
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2023-42793
Check the vendor's security advisory channel for the patched TeamCity versions and workarounds.
Common questions about CVE-2023-42793
Is CVE-2023-42793 actively exploited?
Yes. CVE-2023-42793 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2023-10-04, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 100%. CISA also reports it is known to be used in ransomware campaigns.
What is the CISA deadline and required action for CVE-2023-42793?
CISA set the federal (BOD 22-01) remediation due date at 2023-10-25, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
What fixes CVE-2023-42793?
Check the vendor's security advisory for the patched TeamCity versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2023-42793?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2023-42793's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
Scope and sources
- More exploited JetBrains CVEs
- Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.