Vulnerability-Lookup

CVE-2026-76203 (GCVE-0-2026-76203)

Vulnerability from cvelistv5 – Published: 2026-08-19 14:23 – Updated: 2026-08-19 14:23 X_Open Source

Title

CSS sanitizer bypass in Pentestify report themes allows forced outbound requests

Summary

Incorrect Behavior Order: Validate Before Canonicalize in the report theme CSS sanitizer in maalfer Pentestify 1.2.0 through 2.3.2 allows an authenticated user to force outbound HTTP requests from other users' browsers, disclosing their IP address and User-Agent, via CSS hex escapes that reconstruct the url() function and evade the sanitizer blocklist

Severity

5.1 (Medium)


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

CWE

CWE-180 - Incorrect behavior order: validate before canonicalize

Assigner

Secur0 INCIBE root

References

2 references

URL	Tags
https://github.com/ccyl13/Pentestify/commit/1ed1a…	patch
https://secur0.com/en/cna/cve-list/cve-2026-76203…	technical-description

Impacted products

1 product

Vendor	Product	Version	CPE status
maalfer	Pentestify	Affected: 1.2.0 , < 1ed1aad (custom) cpe:2.3:a:maalfer:pentestify::::::::

Date Public

2026-08-19 12:14

Credits

Manuel Martínez Casasola Xoán M. Otero Jorge Secur0 CNA Mario Álvarez Fernández

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "report themes",
            "application settings"
          ],
          "product": "Pentestify",
          "programFiles": [
            "backend/schemas.py",
            "js/app.js"
          ],
          "repo": "https://github.com/ccyl13/Pentestify",
          "vendor": "maalfer",
          "versions": [
            {
              "lessThan": "1ed1aad",
              "status": "affected",
              "version": "1.2.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:maalfer:pentestify:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "1ed1aad",
                  "versionStartIncluding": "1.2.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "OR"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Manuel Mart\u00ednez Casasola"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "Xo\u00e1n M. Otero Jorge"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Secur0 CNA"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Mario \u00c1lvarez Fern\u00e1ndez"
        }
      ],
      "datePublic": "2026-08-19T12:14:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Incorrect Behavior Order: Validate Before Canonicalize in the report theme CSS sanitizer\nin maalfer Pentestify 1.2.0 through 2.3.2 allows an authenticated user to force outbound\nHTTP requests from other users\u0027 browsers, disclosing their IP address and User-Agent, via\nCSS hex escapes that reconstruct the url() function and evade the sanitizer blocklist"
            }
          ],
          "value": "Incorrect Behavior Order: Validate Before Canonicalize in the report theme CSS sanitizer\nin maalfer Pentestify 1.2.0 through 2.3.2 allows an authenticated user to force outbound\nHTTP requests from other users\u0027 browsers, disclosing their IP address and User-Agent, via\nCSS hex escapes that reconstruct the url() function and evade the sanitizer blocklist"
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-267",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-267: Leverage Alternate Encoding"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-180",
              "description": "CWE-180 Incorrect behavior order: validate before canonicalize",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T14:23:17.894Z",
        "orgId": "4daa8cea-433a-44bd-9456-53b127fc289a",
        "shortName": "Secur0"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/ccyl13/Pentestify/commit/1ed1aadadb02e959af470aac9958462048f7f5f5"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://secur0.com/en/cna/cve-list/cve-2026-76203-css-sanitizer-bypass-pentestify-report-themes"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Tagged releases\n\u003ccode\u003ev2.0.0\u003c/code\u003e, \u003ccode\u003ev2.2.0\u003c/code\u003e, \u003ccode\u003ev2.3.0\u003c/code\u003e and \u003ccode\u003ev2.3.2\u003c/code\u003e shipped vulnerable. \u003ccode\u003ev1.1.1\u003c/code\u003e is not affected\n(no \u003ccode\u003ecustom_css\u003c/code\u003e field). The fix is not tagged and does not bump the version constant,\nso the upper bound cannot be stated as a version until a release is cut. It\u00b4s recommended to install from the repository."
            }
          ],
          "value": "Tagged releases\nv2.0.0, v2.2.0, v2.3.0 and v2.3.2 shipped vulnerable. v1.1.1 is not affected\n(no custom_css field). The fix is not tagged and does not bump the version constant,\nso the upper bound cannot be stated as a version until a release is cut. It\u00b4s recommended to install from the repository."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "tags": [
        "x_open-source"
      ],
      "title": "CSS sanitizer bypass in Pentestify report themes allows forced outbound requests",
      "x_generator": {
        "engine": "Vulnogram 1.0.4"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4daa8cea-433a-44bd-9456-53b127fc289a",
    "assignerShortName": "Secur0",
    "cveId": "CVE-2026-76203",
    "datePublished": "2026-08-19T14:23:17.894Z",
    "dateReserved": "2026-08-19T11:15:20.167Z",
    "dateUpdated": "2026-08-19T14:23:17.894Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-76203",
      "date": "2026-08-20",
      "epss": "0.00289",
      "percentile": "0.21531"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-76203\",\"sourceIdentifier\":\"4daa8cea-433a-44bd-9456-53b127fc289a\",\"published\":\"2026-08-19T15:18:10.450\",\"lastModified\":\"2026-08-19T15:18:10.450\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Incorrect Behavior Order: Validate Before Canonicalize in the report theme CSS sanitizer\\nin maalfer Pentestify 1.2.0 through 2.3.2 allows an authenticated user to force outbound\\nHTTP requests from other users\u0027 browsers, disclosing their IP address and User-Agent, via\\nCSS hex escapes that reconstruct the url() function and evade the sanitizer blocklist\"}],\"affected\":[{\"source\":\"4daa8cea-433a-44bd-9456-53b127fc289a\",\"affectedData\":[{\"vendor\":\"maalfer\",\"product\":\"Pentestify\",\"defaultStatus\":\"unaffected\",\"modules\":[\"report themes\",\"application settings\"],\"programFiles\":[\"backend/schemas.py\",\"js/app.js\"],\"repo\":\"https://github.com/ccyl13/Pentestify\",\"versions\":[{\"version\":\"1.2.0\",\"lessThan\":\"1ed1aad\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"4daa8cea-433a-44bd-9456-53b127fc289a\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/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\",\"baseScore\":5.1,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"PASSIVE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"LOW\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"LOW\",\"subIntegrityImpact\":\"LOW\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"4daa8cea-433a-44bd-9456-53b127fc289a\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-180\"}]}],\"references\":[{\"url\":\"https://github.com/ccyl13/Pentestify/commit/1ed1aadadb02e959af470aac9958462048f7f5f5\",\"source\":\"4daa8cea-433a-44bd-9456-53b127fc289a\"},{\"url\":\"https://secur0.com/en/cna/cve-list/cve-2026-76203-css-sanitizer-bypass-pentestify-report-themes\",\"source\":\"4daa8cea-433a-44bd-9456-53b127fc289a\"}]}}"
  }
}

FKIE_CVE-2026-76203

Vulnerability from fkie_nvd - Published: 2026-08-19 15:18 - Updated: 2026-08-19 15:18

Severity

5.1 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Summary

References

	URL	Tags
	4daa8cea-433a-44bd-9456-53b127fc289a	https://github.com/ccyl13/Pentestify/commit/1ed1aadadb02e959af470aac9958462048f7f5f5
	4daa8cea-433a-44bd-9456-53b127fc289a	https://secur0.com/en/cna/cve-list/cve-2026-76203-css-sanitizer-bypass-pentestify-report-themes

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "report themes",
            "application settings"
          ],
          "product": "Pentestify",
          "programFiles": [
            "backend/schemas.py",
            "js/app.js"
          ],
          "repo": "https://github.com/ccyl13/Pentestify",
          "vendor": "maalfer",
          "versions": [
            {
              "lessThan": "1ed1aad",
              "status": "affected",
              "version": "1.2.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "4daa8cea-433a-44bd-9456-53b127fc289a"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Incorrect Behavior Order: Validate Before Canonicalize in the report theme CSS sanitizer\nin maalfer Pentestify 1.2.0 through 2.3.2 allows an authenticated user to force outbound\nHTTP requests from other users\u0027 browsers, disclosing their IP address and User-Agent, via\nCSS hex escapes that reconstruct the url() function and evade the sanitizer blocklist"
    }
  ],
  "id": "CVE-2026-76203",
  "lastModified": "2026-08-19T15:18:10.450",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 5.1,
          "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": "LOW",
          "subIntegrityImpact": "LOW",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "4daa8cea-433a-44bd-9456-53b127fc289a",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-19T15:18:10.450",
  "references": [
    {
      "source": "4daa8cea-433a-44bd-9456-53b127fc289a",
      "url": "https://github.com/ccyl13/Pentestify/commit/1ed1aadadb02e959af470aac9958462048f7f5f5"
    },
    {
      "source": "4daa8cea-433a-44bd-9456-53b127fc289a",
      "url": "https://secur0.com/en/cna/cve-list/cve-2026-76203-css-sanitizer-bypass-pentestify-report-themes"
    }
  ],
  "sourceIdentifier": "4daa8cea-433a-44bd-9456-53b127fc289a",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-180"
        }
      ],
      "source": "4daa8cea-433a-44bd-9456-53b127fc289a",
      "type": "Secondary"
    }
  ]
}

GHSA-6XGW-5Q2H-P29F

Vulnerability from github – Published: 2026-08-19 15:32 – Updated: 2026-08-19 15:32

Details

Severity

5.1 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-76203"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-180"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-19T15:18:10Z",
    "severity": "MODERATE"
  },
  "details": "Incorrect Behavior Order: Validate Before Canonicalize in the report theme CSS sanitizer\nin maalfer Pentestify 1.2.0 through 2.3.2 allows an authenticated user to force outbound\nHTTP requests from other users\u0027 browsers, disclosing their IP address and User-Agent, via\nCSS hex escapes that reconstruct the url() function and evade the sanitizer blocklist",
  "id": "GHSA-6xgw-5q2h-p29f",
  "modified": "2026-08-19T15:32:39Z",
  "published": "2026-08-19T15:32:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76203"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ccyl13/Pentestify/commit/1ed1aadadb02e959af470aac9958462048f7f5f5"
    },
    {
      "type": "WEB",
      "url": "https://secur0.com/en/cna/cve-list/cve-2026-76203-css-sanitizer-bypass-pentestify-report-themes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/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-2026-76203 (GCVE-0-2026-76203)

FKIE_CVE-2026-76203

GHSA-6XGW-5Q2H-P29F

Tags

Sightings

Nomenclature