An access control bypass vulnerability in the Dapr runtime allows low-privileged attackers to circumvent security policies via reserved URL characters, creating significant risk for distributed applications.

This issue involves improper limitation of a pathname to a restricted directory and improper access control, where the access control list evaluates a normalized method path independently from the dispatch layer using low privileges.

A successful exploit permits unauthorized service invocation, which can lead to severe data compromise and unauthorized modification of backend resources across cloud and edge environments. The high CVSS score of 8.1 reflects the potential for high confidentiality and integrity impacts, making prompt remediation vital to maintain organizational trust and system integrity.

Immediate Action: Update Dapr to version 1.15.14, 1.16.14, 1.17.5, or later, depending on the active deployment branch.

Proactive Monitoring: Monitor API gateway and service invocation logs for unusual path characters, directory traversal sequences, or unauthorized access attempts.

Compensating Controls: Implement strict network segmentation and API gateway policies to restrict direct service-to-service communication paths where possible.

Public Exploit Available: No

Administrators must treat this vulnerability with high urgency given its high CVSS severity rating and potential for severe impact on distributed application environments. Apply the recommended runtime updates immediately to neutralize the path traversal risk and restore proper access control enforcement.