CVE-2026-5538

| EUVD-2026-19024 MEDIUM
2026-04-05 VulDB GHSA-fpw6-p57h-mv5q
5.3
CVSS 4.0
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CVSS Vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Analysis Generated
Apr 05, 2026 - 04:00 vuln.today
EUVD ID Assigned
Apr 05, 2026 - 04:00 euvd
EUVD-2026-19024
CVE Published
Apr 05, 2026 - 03:15 nvd
MEDIUM 5.3

Tags

SSRF

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.

Analysis

Server-side request forgery (SSRF) in QingdaoU OnlineJudge up to version 1.6.1 allows authenticated remote attackers to perform arbitrary HTTP requests via the judge_server_heartbeat endpoint's service_url parameter, enabling potential exfiltration of internal data, interaction with internal services, or lateral movement within the target network. The vendor has not responded to disclosure attempts, and no official patch has been released.

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Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +26
POC: 0

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CVE-2026-5538 vulnerability details – vuln.today
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