CVE-2026-5538 | QingdaoU OnlineJudge up to 1.6.1 judge_server_heartbeat Endpoint JudgeServer.service_url server-side request forgery

VDB-355291 · CVE-2026-5538 · GCVE-100-355291 QINGDAOU ONLINEJUDGE UP TO 1.6.1 JUDGE_SERVER_HEARTBEAT ENDPOINT JUDGESERVER.SERVICE_URL SERVER-SIDE REQUEST FORGERY HISTORYDIFFRELATEJSONXMLCTI Summaryinfo A vulnerability classified as critical has been found in QingdaoU OnlineJudge up to 1.6.1. This affects the function service_url of the file JudgeServer.service_url of the component judge_server_heartbeat Endpoint. This manipulation causes server-side request forgery. This vulnerability is handled as CVE-2026-5538. The attack can be initiated remotely. There is not any exploit available. The vendor was contacted early about this disclosure but did not respond in any way. Detailsinfo A vulnerability was found in QingdaoU OnlineJudge up to 1.6.1. It has been declared as critical. Affected by this vulnerability is the function service_url of the file JudgeServer.service_url of the component judge_server_heartbeat Endpoint. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-5538. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/04/2026). The vendor was contacted early about this disclosure but did not respond in any way. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Vendor QingdaoU Name OnlineJudge Version 1.6.0 1.6.1 CPE 2.3info 🔒 🔒 CPE 2.2info 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.1 VulDB Base Score: 6.3 VulDB Temp Score: 6.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Server-side request forgery CWE: CWE-918 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/04/2026 Advisory disclosed 04/04/2026 +0 days VulDB entry created 04/04/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Not defined CVE: CVE-2026-5538 (🔒) GCVE (CVE): GCVE-0-2026-5538 GCVE (VulDB): GCVE-100-355291 Entryinfo Created: 04/04/2026 08:49 Changes: 04/04/2026 08:49 (54) Complete: 🔍 Submitter: Ana10gy Cache ID: 99:E82:101 Submitinfo Accepted Submit #782203: QingdaoU OnlineJudge <=v1.6.1 Stored SSRF (by Ana10gy) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸