Vulnerability-Lookup

GHSA-9V2G-37MP-QPXF

Vulnerability from github – Published: 2026-05-21 21:30 – Updated: 2026-06-24 20:58

Summary

Concrete CMS has Stored XSS through its height parameter

Details

Severity

7.3 (High)


                  
                    CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "concrete5/concrete5"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.5.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-8203"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-24T18:10:12Z",
    "nvd_published_at": "2026-05-21T21:16:33Z",
    "severity": "HIGH"
  },
  "details": "Concrete CMS 9.5.0 and below has Stored XSS on the height parameter.\u00a0The controller does not validate or sanitize $height.\u00a0Any user with editor privileges can inject malicious JavaScript that executes in the context of any visitor\u0027s browser, potentially leading to session hijacking, credential theft, or other malicious actions.",
  "id": "GHSA-9v2g-37mp-qpxf",
  "modified": "2026-06-24T20:58:10Z",
  "published": "2026-05-21T21:30:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8203"
    },
    {
      "type": "WEB",
      "url": "https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/concretecms/concretecms"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Concrete CMS has Stored XSS through its height parameter"
}

CVE-2026-8203 (GCVE-0-2026-8203)

Vulnerability from cvelistv5 – Published: 2026-05-21 20:31 – Updated: 2026-05-22 13:21

Title

Concrete CMS 9.5.0 and below has Stored XSS on the height parameter

Summary

Concrete CMS 9.5.0 and below has Stored XSS on the height parameter. The controller does not validate or sanitize $height. Any user with editor privileges can inject malicious JavaScript that executes in the context of any visitor's browser, potentially leading to session hijacking, credential theft, or other malicious actions. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 7.3 with vector CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Alfin Joseph for reporting.

Severity

7.3 (High)


                        
                          CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')

Assigner

ConcreteCMS

References

1 reference

URL	Tags
https://documentation.concretecms.org/9-x/develop…	release-notes

Impacted products

1 product

Vendor	Product	Version
Concrete CMS	Concrete CMS	Affected: 5 , ≤ 9.5.0 (git)

Credits

Alfin Joseph

Show details on NVD website

JSON

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        "metrics": [
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            "other": {
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                "id": "CVE-2026-8203",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-22T13:21:41.592485Z",
                "version": "2.0.3"
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        "providerMetadata": {
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    "cna": {
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          "defaultStatus": "unaffected",
          "product": "Concrete CMS",
          "repo": "https://github.com/concretecms/concretecms",
          "vendor": "Concrete CMS",
          "versions": [
            {
              "lessThanOrEqual": "9.5.0",
              "status": "affected",
              "version": "5",
              "versionType": "git"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Alfin Joseph"
        }
      ],
      "descriptions": [
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          "supportingMedia": [
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              "base64": false,
              "type": "text/html",
              "value": "Concrete CMS 9.5.0 and below has Stored XSS on the height parameter.\u0026nbsp;\u003cspan\u003eThe controller does not validate or sanitize \u003c/span\u003e\u003ccode\u003e$height\u003c/code\u003e\u003cspan\u003e.\u0026nbsp;\u003c/span\u003e\u003cspan\u003eAny user with editor privileges can inject malicious JavaScript that executes in the context of any visitor\u0027s browser, potentially leading to session hijacking, credential theft, or other malicious actions.\u0026nbsp;\u003c/span\u003eThe Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of\u0026nbsp;7.3 with vector\u0026nbsp;CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks\u0026nbsp;Alfin Joseph for reporting.\u0026nbsp;\u003cdiv\u003e\u003c/div\u003e\u003cbr\u003e\u003cbr\u003e"
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          ],
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      ],
      "impacts": [
        {
          "capecId": "CAPEC-198",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-198 XSS Targeting Error Pages"
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          ]
        }
      ],
      "metrics": [
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          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "HIGH",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
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      "providerMetadata": {
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        "orgId": "ff5b8ace-8b95-4078-9743-eac1ca5451de",
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      "references": [
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          "tags": [
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          ],
          "url": "https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes"
        }
      ],
      "source": {
        "advisory": "https://hackerone.com/reports/3607565",
        "defect": [
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    "datePublished": "2026-05-21T20:31:56.536Z",
    "dateReserved": "2026-05-09T00:02:43.920Z",
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  },
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}

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.

Action not permitted

GHSA-9V2G-37MP-QPXF

CVE-2026-8203 (GCVE-0-2026-8203)

Tags

Sightings

Nomenclature