Vulnerability-Lookup

GHSA-HQ87-Q544-6GRJ

Vulnerability from github – Published: 2026-09-02 18:32 – Updated: 2026-09-02 18:32

Details

Jenkins Customizable Header Plugin 295.v2544b_ca_19b_97 and earlier allows overwriting the plugin's appearance configuration through Stapler data binding, allowing attackers to configure a custom SVG icon containing inline JavaScript, resulting in a stored cross-site scripting (XSS) vulnerability.

Severity

8.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-84673"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-02T16:17:31Z",
    "severity": "HIGH"
  },
  "details": "Jenkins Customizable Header Plugin 295.v2544b_ca_19b_97 and earlier allows overwriting the plugin\u0027s appearance configuration through Stapler data binding, allowing attackers to configure a custom SVG icon containing inline JavaScript, resulting in a stored cross-site scripting (XSS) vulnerability.",
  "id": "GHSA-hq87-q544-6grj",
  "modified": "2026-09-02T18:32:25Z",
  "published": "2026-09-02T18:32:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84673"
    },
    {
      "type": "WEB",
      "url": "https://www.jenkins.io/security/advisory/2026-09-02/#SECURITY-4104"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-84673 (GCVE-0-2026-84673)

Vulnerability from cvelistv5 – Published: 2026-09-02 15:40 – Updated: 2026-09-02 16:54

Summary

Severity

8.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 16:54 UTC

CWE

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

Assigner

jenkins mitre root

References

1 reference

URL	Tags
https://www.jenkins.io/security/advisory/2026-09-…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Jenkins Project	Jenkins Customizable Header Plugin	Affected: 0 , ≤ 295.v2544b_ca_19b_97 (maven)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-84673",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-02T16:54:44.826509Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-79",
                "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-02T16:54:48.644Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Jenkins Customizable Header Plugin",
          "vendor": "Jenkins Project",
          "versions": [
            {
              "lessThanOrEqual": "295.v2544b_ca_19b_97",
              "status": "affected",
              "version": "0",
              "versionType": "maven"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Jenkins Customizable Header Plugin 295.v2544b_ca_19b_97 and earlier allows overwriting the plugin\u0027s appearance configuration through Stapler data binding, allowing attackers to configure a custom SVG icon containing inline JavaScript, resulting in a stored cross-site scripting (XSS) vulnerability."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-02T15:40:56.344Z",
        "orgId": "39769cd5-e6e2-4dc8-927e-97b3aa056f5b",
        "shortName": "jenkins"
      },
      "references": [
        {
          "name": "Jenkins Security Advisory 2026-09-02",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.jenkins.io/security/advisory/2026-09-02/#SECURITY-4104"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "39769cd5-e6e2-4dc8-927e-97b3aa056f5b",
    "assignerShortName": "jenkins",
    "cveId": "CVE-2026-84673",
    "datePublished": "2026-09-02T15:40:56.344Z",
    "dateReserved": "2026-09-01T21:55:27.035Z",
    "dateUpdated": "2026-09-02T16:54:48.644Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

GHSA-HQ87-Q544-6GRJ

CVE-2026-84673 (GCVE-0-2026-84673)

Tags

Sightings

Nomenclature