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CVE-2023-42793

JetBrains TeamCity Authentication Bypass

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 100.0%
  1. Published19 Sept 2023
  2. Added to CISA KEV4 Oct 2023
  3. Remediation due25 Oct 2023
Actively exploited (CISA KEV)

JetBrains TeamCity contains an authentication bypass vulnerability that allows for remote code execution on TeamCity Server.

Added to KEV: 4 Oct 2023Federal remediation due: 25 Oct 2023Used in ransomware

Description

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

JetBrains Teamcity< 2023.05.4

Remediation

Fixed in
JetBrains Teamcity≥ 2023.05.4

References

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Frequently asked

Is CVE-2023-42793 being actively exploited?

Yes. CVE-2023-42793 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 4 Oct 2023. It has been used in ransomware campaigns.

How severe is CVE-2023-42793?

CVE-2023-42793 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 100.0% probability of exploitation.

Which products are affected by CVE-2023-42793?

Affected products include JetBrains Teamcity.

How do I fix CVE-2023-42793?

Upgrade affected software to a fixed version, for example JetBrains Teamcity 2023.05.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-42793 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.