JetBrains - Authentication Bypass (CVE-2023-42793)

CVE-2023-42793 is a critical vulnerability in JetBrains TeamCity, where an authentication bypass can enable remote code execution on the TeamCity server.

CrowdSec has been tracking this vulnerability and its exploits since 15th of December 2023.

CrowdSec network observations suggest that most exploitation of CVE-2023-42793 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental. CrowdSec network telemetry also shows that exploitation of CVE-2023-42793 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Attack attempts aim to exploit weaknesses in the TeamCity authentication process, usually by targeting exposed server endpoints in tailored campaigns.