MantisBT - Authentication Bypass (CVE-2026-30849)

CVE-2026-30849 is a critical authentication bypass vulnerability in MantisBT versions prior to 2.28.1 running on MySQL-family databases. An unauthenticated attacker who knows a victim’s username can submit a crafted SOAP envelope to access that user’s SOAP API account without their password and execute available API functions, potentially exposing sensitive information or modifying tracker data.

CrowdSec has been tracking this vulnerability and its exploits since 17th of September 2026.

Data from the CrowdSec community indicates that exploitation of CVE-2026-30849 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2026-30849 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2026-30849 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

Attackers target the MantisBT SOAP endpoint /api/soap/mantisconnect.php with a crafted mc_login SOAP request. The exploit uses a type-confused password parameter, such as an integer value instead of a string, to bypass authentication for a known username.