Vulnerability-Lookup

CVE-2026-5538 (GCVE-0-2026-5538)

Vulnerability from cvelistv5 – Published: 2026-04-05 03:15 – Updated: 2026-04-06 16:34

Title

QingdaoU OnlineJudge judge_server_heartbeat Endpoint JudgeServer.service_url server-side request forgery

Summary

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.

Severity

5.3 (Medium)


                        
                          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

6.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R

6.3 (Medium)


                        
                          CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-06 16:33 UTC

CWE

CWE-918 - Server-Side Request Forgery

Assigner

VulDB

References

4 references

URL	Tags
https://vuldb.com/vuln/355291	vdb-entrytechnical-description
https://vuldb.com/vuln/355291/cti	signaturepermissions-required
https://vuldb.com/submit/782203	third-party-advisory
https://github.com/AnalogyC0de/public_exp/issues/27	issue-tracking

Impacted products

1 product

Vendor	Product	Version
QingdaoU	OnlineJudge	Affected: 1.6.0 Affected: 1.6.1

Credits

Ana10gy (VulDB User) VulDB CNA Team

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-5538

Vulnerability from fkie_nvd - Published: 2026-04-05 04:16 - Updated: 2026-06-17 10:59

Severity

6.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Summary

References

	URL	Tags
	cna@vuldb.com	https://github.com/AnalogyC0de/public_exp/issues/27
	cna@vuldb.com	https://vuldb.com/submit/782203
	cna@vuldb.com	https://vuldb.com/vuln/355291
	cna@vuldb.com	https://vuldb.com/vuln/355291/cti

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "modules": [
            "judge_server_heartbeat Endpoint"
          ],
          "product": "OnlineJudge",
          "vendor": "QingdaoU",
          "versions": [
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              "version": "1.6.0"
            },
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            }
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    }
  ],
  "id": "CVE-2026-5538",
  "lastModified": "2026-06-17T10:59:11.947",
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        "acInsufInfo": false,
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        "type": "Secondary",
        "userInteractionRequired": false
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        "impactScore": 3.4,
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          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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",
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          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@vuldb.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-5538",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-06T16:33:27.220465Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-05T04:16:15.950",
  "references": [
    {
      "source": "cna@vuldb.com",
      "url": "https://github.com/AnalogyC0de/public_exp/issues/27"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/submit/782203"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/vuln/355291"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/vuln/355291/cti"
    }
  ],
  "sourceIdentifier": "cna@vuldb.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "cna@vuldb.com",
      "type": "Secondary"
    }
  ]
}

GHSA-FPW6-P57H-MV5Q

Vulnerability from github – Published: 2026-04-05 06:32 – Updated: 2026-04-05 06:32

Details

Severity

6.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

5.3 (Medium)


                  
                    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

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-5538"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-05T04:16:15Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-fpw6-p57h-mv5q",
  "modified": "2026-04-05T06:32:02Z",
  "published": "2026-04-05T06:32:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5538"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AnalogyC0de/public_exp/issues/27"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/782203"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/355291"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/355291/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-5538 (GCVE-0-2026-5538)

FKIE_CVE-2026-5538

GHSA-FPW6-P57H-MV5Q

Tags

Sightings

Nomenclature