Vulnerability-Lookup

CVE-2026-4103 (GCVE-0-2026-4103)

Vulnerability from cvelistv5 – Published: 2026-09-14 15:54 – Updated: 2026-09-14 19:22

Title

Cross-Site Scripting via HTML Sanitization in WSO2 Publisher and Developer Portals Allows Malicious Script Execution

Summary

Insufficient HTML sanitization in the Publisher Portal and Developer Portal allows untrusted user input to be rendered without proper encoding or neutralization. This enables the injection and execution of malicious JavaScript when affected API documents are viewed. Successful exploitation may result in the execution of malicious scripts within the user's browser context when viewing API documentation. Users with permissions to access the API documentation through these portals may be impacted, potentially allowing attackers to perform actions on behalf of the user, depending on their session privileges.

Severity

6.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 19:12 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

WSO2 mitre root

References

1 reference

URL	Tags
https://security.docs.wso2.com/en/latest/security…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version	CPE status
WSO2	WSO2 API Control Plane	Affected: 4.5.0 , < 4.5.0.55 (custom) Affected: 4.6.0 , < 4.6.0.19 (custom) cpe:2.3:a:wso2:wso2_api_control_plane:::::::: cpe:2.3:a:wso2:wso2_api_control_plane::::::::
WSO2	WSO2 API Manager	Unknown: 0 , < 3.2.0 (custom) Affected: 3.2.0 , < 3.2.0.470 (custom) Affected: 3.2.1 , < 3.2.1.89 (custom) Affected: 4.1.0 , < 4.1.0.254 (custom) Affected: 4.2.0 , < 4.2.0.194 (custom) Affected: 4.3.0 , < 4.3.0.105 (custom) Affected: 4.4.0 , < 4.4.0.69 (custom) Affected: 4.5.0 , < 4.5.0.54 (custom) Affected: 4.6.0 , < 4.6.0.18 (custom) cpe:2.3:a:wso2:wso2_api_manager:::::::: cpe:2.3:a:wso2:wso2_api_manager:::::::: cpe:2.3:a:wso2:wso2_api_manager:::::::: cpe:2.3:a:wso2:wso2_api_manager:::::::: cpe:2.3:a:wso2:wso2_api_manager:::::::: cpe:2.3:a:wso2:wso2_api_manager:::::::: cpe:2.3:a:wso2:wso2_api_manager:::::::: cpe:2.3:a:wso2:wso2_api_manager::::::::

Credits

San Gil from Security Office

Show details on NVD website

JSON

To clipboard

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      "cveMetadata": "{\"cveId\": \"CVE-2026-4103\", \"assignerOrgId\": \"ed10eef1-636d-4fbe-9993-6890dfa878f8\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"WSO2\", \"dateReserved\": \"2026-03-13T06:07:54.085Z\", \"datePublished\": \"2026-09-14T15:54:05.548Z\", \"dateUpdated\": \"2026-09-14T19:22:59.838Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-4103

Vulnerability from fkie_nvd - Published: 2026-09-14 16:17 - Updated: 2026-09-14 20:16

Severity

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

Summary

References

	URL	Tags
	ed10eef1-636d-4fbe-9993-6890dfa878f8	https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-4844/

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "WSO2 API Control Plane",
          "vendor": "WSO2",
          "versions": [
            {
              "lessThan": "4.5.0.55",
              "status": "affected",
              "version": "4.5.0",
              "versionType": "custom"
            },
            {
              "lessThan": "4.6.0.19",
              "status": "affected",
              "version": "4.6.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "WSO2 API Manager",
          "vendor": "WSO2",
          "versions": [
            {
              "lessThan": "3.2.0",
              "status": "unknown",
              "version": "0",
              "versionType": "custom"
            },
            {
              "lessThan": "3.2.0.470",
              "status": "affected",
              "version": "3.2.0",
              "versionType": "custom"
            },
            {
              "lessThan": "3.2.1.89",
              "status": "affected",
              "version": "3.2.1",
              "versionType": "custom"
            },
            {
              "lessThan": "4.1.0.254",
              "status": "affected",
              "version": "4.1.0",
              "versionType": "custom"
            },
            {
              "lessThan": "4.2.0.194",
              "status": "affected",
              "version": "4.2.0",
              "versionType": "custom"
            },
            {
              "lessThan": "4.3.0.105",
              "status": "affected",
              "version": "4.3.0",
              "versionType": "custom"
            },
            {
              "lessThan": "4.4.0.69",
              "status": "affected",
              "version": "4.4.0",
              "versionType": "custom"
            },
            {
              "lessThan": "4.5.0.54",
              "status": "affected",
              "version": "4.5.0",
              "versionType": "custom"
            },
            {
              "lessThan": "4.6.0.18",
              "status": "affected",
              "version": "4.6.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "ed10eef1-636d-4fbe-9993-6890dfa878f8"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Insufficient HTML sanitization in the Publisher Portal and Developer Portal allows untrusted user input to be rendered without proper encoding or neutralization. This enables the injection and execution of malicious JavaScript when affected API documents are viewed.\n\nSuccessful exploitation may result in the execution of malicious scripts within the user\u0027s browser context when viewing API documentation. Users with permissions to access the API documentation through these portals may be impacted, potentially allowing attackers to perform actions on behalf of the user, depending on their session privileges."
    }
  ],
  "id": "CVE-2026-4103",
  "lastModified": "2026-09-14T20:16:44.490",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 2.7,
        "source": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-4103",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-14T19:12:26.565275Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-14T16:17:11.710",
  "references": [
    {
      "source": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
      "url": "https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-4844/"
    }
  ],
  "sourceIdentifier": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
      "type": "Secondary"
    }
  ]
}

GHSA-WFVC-6JJF-4G5G

Vulnerability from github – Published: 2026-09-14 18:31 – Updated: 2026-09-14 18:31

Details

Successful exploitation may result in the execution of malicious scripts within the user's browser context when viewing API documentation. Users with permissions to access the API documentation through these portals may be impacted, potentially allowing attackers to perform actions on behalf of the user, depending on their session privileges.

Severity

6.4 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-4103"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-14T16:17:11Z",
    "severity": "MODERATE"
  },
  "details": "Insufficient HTML sanitization in the Publisher Portal and Developer Portal allows untrusted user input to be rendered without proper encoding or neutralization. This enables the injection and execution of malicious JavaScript when affected API documents are viewed.\n\nSuccessful exploitation may result in the execution of malicious scripts within the user\u0027s browser context when viewing API documentation. Users with permissions to access the API documentation through these portals may be impacted, potentially allowing attackers to perform actions on behalf of the user, depending on their session privileges.",
  "id": "GHSA-wfvc-6jjf-4g5g",
  "modified": "2026-09-14T18:31:20Z",
  "published": "2026-09-14T18:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4103"
    },
    {
      "type": "WEB",
      "url": "https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-4844"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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-2026-4103 (GCVE-0-2026-4103)

FKIE_CVE-2026-4103

GHSA-WFVC-6JJF-4G5G

Tags

Sightings

Nomenclature