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CVE-2026-5538— QingdaoU OnlineJudge judge_server_heartbeat Endpoint JudgeServer.service_url server-side request forgery

Quick assessment

Affected
QingdaoU OnlineJudge
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OnlineJudge是Qingdao University开源的一个在线编程评测系统。 OnlineJudge 1.6.1及之前版本存在代码问题漏洞，该漏洞源于函数service_url存在服务器端请求伪造。

CVSS 6.3 · Medium EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1105 · Ingress Tool Transfer
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I. Basic Information for CVE-2026-5538

Vulnerability Information
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Vulnerability Title
QingdaoU OnlineJudge judge_server_heartbeat Endpoint JudgeServer.service_url server-side request forgery
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in QingdaoU OnlineJudge up to 1.6.1. Affected by this issue is the function service_url of the file JudgeServer.service_url of the component judge_server_heartbeat Endpoint. The manipulation results in server-side request forgery. It is possible to launch the attack remotely. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
OnlineJudge 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OnlineJudge是Qingdao University开源的一个在线编程评测系统。 OnlineJudge 1.6.1及之前版本存在代码问题漏洞，该漏洞源于函数service_url存在服务器端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
QingdaoU OnlineJudge 1.6.0 -

II. Public POCs for CVE-2026-5538

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III. Intelligence Information for CVE-2026-5538

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Proof of Concept for CVE-2026-5538 (1)

IV. Related Vulnerabilities

Same weakness: CWE-918

V. Comments for CVE-2026-5538

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