CVE-2024-23917: In JetBrains TeamCity before 2023.11.3 authentication bypass leading to RCE was possible

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 17 Oct 2025. VulnCheck's own honeypots also recorded exploitation attempts.

How likely is exploitation in the next 30 days?

54%

EPSS score, percentile 99 of all scored records. A probability estimated by FIRST, not a report of exploitation.

CISA's SSVC assessment in the CVE record lists exploitation as poc.

How severe?

9.8 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

• before 2023.11.3

Versions by product

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 30 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

In JetBrains TeamCity before 2023.11.3 authentication bypass leading to RCE was possible

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Source: CVE List, as of 30 Oct 2026. About the data.

Timeline

Known exploited JetBrains vulnerabilities

• CVE-2026-63077: JetBrains TeamCity Deserialization of Untrusted Data Vulnerability (added 5 Aug 2026)
• CVE-2024-27199: JetBrains TeamCity Relative Path Traversal Vulnerability (added 20 Apr 2026)
• CVE-2024-27198: JetBrains TeamCity Authentication Bypass Vulnerability (added 7 Mar 2024)
• CVE-2023-42793: JetBrains TeamCity Authentication Bypass Vulnerability (added 4 Oct 2023)