A security issue was found in pcs deamon that permits an authorized user (with write permission in pcsd) to escalate privileges and write to any file in the system using a malicious REST call.

pcs before versions 0.9.164 and 0.10 is vulnerable to a debug parameter removal bypass. REST interface of the pcsd service did not properly remove the pcs debug argument from the /runpcs query, possibly disclosing sensitive information. A remote attacker with a valid token could use this flaw to elevate their privilege.