CVE-2026-5538: Server-Side Request Forgery in QingdaoU OnlineJudge
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.
AI Analysis
Technical Summary
This vulnerability allows an attacker to manipulate the service_url function in QingdaoU OnlineJudge (up to version 1.6.1) to perform server-side request forgery via the judge_server_heartbeat endpoint. The issue enables remote attackers with low privileges to induce the server to make unintended HTTP requests. No vendor response or patch has been provided as of the publication date.
Potential Impact
Successful exploitation could allow an attacker to cause the server to make arbitrary HTTP requests, potentially leading to information disclosure or interaction with internal systems not otherwise accessible. The impact is rated medium with a CVSS 4.0 score of 5.3. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vendor has not responded and no official fix is available, users should consider implementing network-level restrictions to limit outbound requests from the affected service as a temporary mitigation.
CVE-2026-5538: Server-Side Request Forgery in QingdaoU OnlineJudge
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability allows an attacker to manipulate the service_url function in QingdaoU OnlineJudge (up to version 1.6.1) to perform server-side request forgery via the judge_server_heartbeat endpoint. The issue enables remote attackers with low privileges to induce the server to make unintended HTTP requests. No vendor response or patch has been provided as of the publication date.
Potential Impact
Successful exploitation could allow an attacker to cause the server to make arbitrary HTTP requests, potentially leading to information disclosure or interaction with internal systems not otherwise accessible. The impact is rated medium with a CVSS 4.0 score of 5.3. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vendor has not responded and no official fix is available, users should consider implementing network-level restrictions to limit outbound requests from the affected service as a temporary mitigation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-04-04T06:44:15.570Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d1dada0a160ebd92844ad0
Added to database: 4/5/2026, 3:45:30 AM
Last enriched: 4/12/2026, 3:06:39 PM
Last updated: 5/19/2026, 6:09:36 PM
Views: 60
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