What is the CVSS score of CVE-2023-42793?

CVE-2023-42793 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 100.0%.

Is there a public PoC exploit available for CVE-2023-42793?

Yes, a public proof-of-concept exploit is available for CVE-2023-42793. Prioritise patching immediately. EPSS: 100.0%.

Teamcity CVE-2023-42793

CRITICAL

Authentication Bypass Using an Alternate Path or Channel (CWE-288)

2023-09-19 cve@jetbrains.com

Authentication Bypass Teamcity JetBrains

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-288 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Alternate path authentication
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Emergency Immediate action required. Why: CRITICAL + in CISA KEV (actively exploited), no patch available.

Exploited in the wild (CISA KEV) No patch listed yet 100.0% exploitation probability (EPSS)

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AnalysisAI

In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-288. In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible Affected products include: Jetbrains Teamcity. Version information: before 2023.05.4.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Sep 19, 2023 - 17:15 nvd

CRITICAL 9.8

DescriptionNVD

In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible

Threat Intelligence Overview

EPSS Score

100.0%

Top 0% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

CISA KEV

EPSS POC (2)

Exploit-DB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV Yes

Public POC Yes

EPSS 100.0%

Patch available No

Active threat Yes

Deciding rule

CRITICAL + in CISA KEV (actively exploited), no patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Immediate

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

High

Priority Score

234

Low Medium High Critical

KEV: +50

EPSS: +100

CVSS: +49

PoC: +20

Weaponized: +15

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:a:jetbrains:teamcity:*:*:*:*:*:*:*:*

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In JetBrains TeamCity before 2024.07 access tokens could continue working after deletion or expiration. Rated critical s

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In JetBrains TeamCity before 2022.04.7, 2022.10.6, 2023.05.6, 2023.11.5 authentication bypass was possible in specific e

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In JetBrains TeamCity before 2023.05 bypass of permission checks allowing to perform admin actions was possible. Rated c

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Same weakness CWE-288 – Authentication Bypass Using an Alternate Path or Channel

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CVE-2024-1709 CRITICAL POC

10.0

CVE-2020-10148 CRITICAL POC

9.8

CVE-2024-55591 CRITICAL POC

9.8

CVE-2025-2747 CRITICAL POC

9.8

CVE-2025-2746 CRITICAL POC

9.8

CVE-2025-4427 MEDIUM POC

5.3

CVE-2025-34026 CRITICAL POC

9.2

CVE-2026-23760 CRITICAL POC

9.3

Same technique Authentication Bypass

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CVE-2015-3306 CRITICAL POC

10.0

CVE-2023-22515 CRITICAL POC

9.8

CVE-2012-4681 CRITICAL POC

9.8

CVE-2013-2465 CRITICAL POC

9.8

CVE-2011-3544 CRITICAL POC

9.8

CVE-2022-40684 CRITICAL POC

9.8

CVE-2025-61882 CRITICAL POC

9.8

CVE-2024-0012 CRITICAL POC

9.3

References

Advisories & patches

ADVISORY https://blog.jetbrains.com/teamcity/2023/09/cve-2023-42793-vulnerability-post-mortem/ ADVISORY https://www.jetbrains.com/privacy-security/issues-fixed/ REF https://attackerkb.com/topics/1XEEEkGHzt/cve-2023-42793 REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-42793 REF https://www.rapid7.com/blog/post/2023/09/25/etr-cve-2023-42793-critical-authentication-bypass-in-jetbrains-teamcity-ci-cd-servers/ REF https://www.securityweek.com/recently-patched-teamcity-vulnerability-exploited-to-hack-servers/

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