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CVE-2021-39320 (GCVE-0-2021-39320)

Vulnerability from cvelistv5 – Published: 2021-09-01 14:15 – Updated: 2025-05-05 14:50
VLAI
Title
underConstruction <= 1.18 - Reflected Cross-Site Scripting
Summary
The underConstruction plugin <= 1.18 for WordPress echoes out the raw value of `$GLOBALS['PHP_SELF']` in the ucOptions.php file. On certain configurations including Apache+modPHP, this makes it possible to use it to perform a reflected Cross-Site Scripting attack by injecting malicious code in the request path.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-05 14:50 UTC
CWE
  • CWE-79 - Cross-site Scripting (XSS)
References
Impacted products
Vendor Product Version CPE status
Noah Kagan underConstruction Affected: 1.18 , ≤ 1.18 (custom)
guessed Create a notification for this product.
Date Public
2021-08-31 00:00
Show details on NVD website

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          "x_legacyV4Record": {
            "CVE_data_meta": {
              "ASSIGNER": "security@wordfence.com",
              "DATE_PUBLIC": "2021-08-31T00:00:00.000Z",
              "ID": "CVE-2021-39320",
              "STATE": "PUBLIC",
              "TITLE": "underConstruction \u003c= 1.18 - Reflected Cross-Site Scripting"
            },
            "affects": {
              "vendor": {
                "vendor_data": [
                  {
                    "product": {
                      "product_data": [
                        {
                          "product_name": "underConstruction",
                          "version": {
                            "version_data": [
                              {
                                "version_affected": "\u003c=",
                                "version_name": "1.18",
                                "version_value": "1.18"
                              }
                            ]
                          }
                        }
                      ]
                    },
                    "vendor_name": "Noah Kagan"
                  }
                ]
              }
            },
            "credit": [
              {
                "lang": "eng",
                "value": "Ramuel Gall, Wordfence"
              }
            ],
            "data_format": "MITRE",
            "data_type": "CVE",
            "data_version": "4.0",
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "The underConstruction plugin \u003c= 1.18 for WordPress echoes out the raw value of `$GLOBALS[\u0027PHP_SELF\u0027]` in the ucOptions.php file. On certain configurations including Apache+modPHP, this makes it possible to use it to perform a reflected Cross-Site Scripting attack by injecting malicious code in the request path."
                }
              ]
            },
            "generator": {
              "engine": "Vulnogram 0.0.9"
            },
            "impact": {
              "cvss": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 6.1,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                "version": "3.1"
              }
            },
            "problemtype": {
              "problemtype_data": [
                {
                  "description": [
                    {
                      "lang": "eng",
                      "value": "CWE-79 Cross-site Scripting (XSS)"
                    }
                  ]
                }
              ]
            },
            "references": {
              "reference_data": [
                {
                  "name": "https://wpscan.com/vulnerability/49ae1df0-d6d2-4cbb-9a9d-bf3599429875",
                  "refsource": "MISC",
                  "url": "https://wpscan.com/vulnerability/49ae1df0-d6d2-4cbb-9a9d-bf3599429875"
                },
                {
                  "name": "https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39320",
                  "refsource": "MISC",
                  "url": "https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39320"
                }
              ]
            },
            "source": {
              "discovery": "INTERNAL"
            }
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "assignerShortName": "Wordfence",
        "cveId": "CVE-2021-39320",
        "datePublished": "2021-09-01T14:15:35.899Z",
        "dateReserved": "2021-08-20T00:00:00.000Z",
        "dateUpdated": "2025-05-05T14:50:43.201Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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