MLflow - Authentication Bypass (CVE-2026-0545)

CVE-2026-0545 is a critical authentication bypass vulnerability in MLflow/MLflow, where FastAPI job endpoints under /ajax-api/3.0/jobs/* are left unprotected even when basic-auth is enabled. This flaw allows any network client to submit, read, search, and cancel jobs without credentials, potentially leading to unauthenticated remote code execution, job spam, denial of service, or data exposure. Attackers could exploit this vulnerability to execute privileged actions or disrupt ML workflows, posing a severe risk to affected deployments.

CrowdSec has been tracking this vulnerability and its exploits since 3rd of June 2026.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2026-0545 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2026-0545 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2026-0545 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

Attackers exploit unauthenticated access to the /ajax-api/3.0/jobs/ endpoint, allowing them to submit and manage jobs without credentials, bypassing authentication controls.