CVE-2026-57111
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
A permissive CORS policy in the REST API (helix-rest) of Apache Helix through version 2.0.0 allows a remote attacker controlling a web page visited by an authorized user to read responses and issue cross-origin requests to administrative endpoints. The CORSFilter unconditionally returns Access-Control-Allow-Origin: * with Access-Control-Allow-Credentials: true and reflects arbitrary request headers.
Risk Assessment
An attacker can exploit this to perform unauthorized cross-origin requests to administrative REST endpoints, potentially gaining access to sensitive data or performing administrative actions on behalf of an authenticated user.
Recommendation
Upgrade Apache Helix to version 2.0.1 immediately. As a temporary mitigation, restrict access to the REST API to trusted origins or disable the vulnerable CORS headers.
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Original NVD description (English source)
Permissive Cross-Origin Resource Sharing (CORS) in the REST API (helix-rest, org.apache.helix.rest.server.filters.CORSFilter) in Apache Helix through 2.0.0 on all platforms allows a remote attacker controlling a web page visited by an authorized user to read responses from and issue cross-origin requests to administrative REST endpoints via a cross-origin request from an arbitrary origin, since the filter unconditionally returns Access-Control-Allow-Origin: * together with Access-Control-Allow-Credentials: true and reflects arbitrary Access-Control-Request-Method / Access-Control-Request-Headers values in preflight responses. Users are recommended to upgrade to version 2.0.1, which fixes this issue.

