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Qingdaou
Onlinejudge
Qingdaou Onlinejudge vulnerabilities
qingdaou
onlinejudge
QingdaoU OnlineJudge judge_server_heartbeat Endpoint JudgeServer.service_url server-side request forgery
CVE-2026-5538
5.3
Medium
April 5, 2026
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