CVE-2026-72533
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk33th percentile - higher than 33% of all known CVEs
Summary
An authentication bypass vulnerability in Portainer CE through 2.44.0 allows authenticated low-privileged users to bypass Docker proxy authorization checks via non-canonical URL normalization, defeating all authorization middleware. The proxy endpoint fails to normalize request paths before applying access controls, allowing crafted requests to be interpreted differently by the proxy and the authorization layer.
Risk Assessment
Risk of an attacker gaining root-level access to the underlying Docker host, potentially leading to full system and data compromise.
Recommendation
Upgrade Portainer CE to a patched version. Additionally, restrict access to the Portainer interface and monitor for unusual requests.
Other vulnerabilities in Portainer CE
See all- CVE-2026-33590High
The insecure default settings of Portainer CE grant regular (non-admin) users privileges that allow host filesystem access and host-level code execution. An authenticated non-administrative user with endpoint access can exploit these settings to read host files or obtain root equivalent access on the host.
- CVE-2024-29296Medium
A user enumeration vulnerability was found in Portainer CE 2.19.4. During the authentication process, a difference in response time allows a remote unauthenticated attacker to determine if a username is valid.
Original NVD description (English source)
An authentication bypass vulnerability in Portainer CE through 2.44.0 allows authenticated low-privileged users to bypass Docker proxy authorization checks via non-canonical URL normalization, defeating all authorization middleware. The proxy endpoint fails to normalize request paths before applying access controls, allowing crafted requests to be interpreted differently by the proxy and the authorization layer. Successful exploitation grants the attacker root-level access to the underlying Docker host.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS