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    2 vulnerabilities by nuxt-content

    CVE-2026-63671 (GCVE-0-2026-63671)

    Vulnerability from nvd – Published: 2026-09-16 14:25 – Updated: 2026-09-16 14:25
    VLAI
    Title
    @nuxtjs/mdc: the URL sanitizer misses SVG xlink:href and data:text/html, allowing XSS from untrusted markdown at the default configuration
    Summary
    MDC is a tool to take regular Markdown and write documents interacting deeply with a Vue component. Prior to 0.22.1, @nuxtjs/mdc uses parseMarkdown with allowDangerousHtml enabled by default and relies on validateProps, validateProp, and unsafeLinkPrefix to remove executable URLs from untrusted Markdown. validateProp checks only attributes named href or src, allowing an SVG xlink:href value represented as xLinkHref to retain a javascript: URL that executes in the page origin when selected. The data:text/html denylist entries are also compared against url.protocol, which is only data:, so an iframe src containing data:text/html survives sanitization and executes in an opaque origin when loaded. Plain href javascript: URLs, srcdoc, object, script, and base elements are already blocked, making these two paths specific sibling gaps in the sanitizer. This issue is fixed in version 0.22.1.
    Severity
    8.1 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    • CWE-184 - Incomplete List of Disallowed Inputs
    Assigner
    References
    Impacted products
    Vendor Product Version
    nuxt-content mdc Affected: < 0.22.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "mdc",
          "vendor": "nuxt-content",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.22.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "MDC is a tool to take regular Markdown and write documents interacting deeply with a Vue component. Prior to 0.22.1, @nuxtjs/mdc uses parseMarkdown with allowDangerousHtml enabled by default and relies on validateProps, validateProp, and unsafeLinkPrefix to remove executable URLs from untrusted Markdown. validateProp checks only attributes named href or src, allowing an SVG xlink:href value represented as xLinkHref to retain a javascript: URL that executes in the page origin when selected. The data:text/html denylist entries are also compared against url.protocol, which is only data:, so an iframe src containing data:text/html survives sanitization and executes in an opaque origin when loaded. Plain href javascript: URLs, srcdoc, object, script, and base elements are already blocked, making these two paths specific sibling gaps in the sanitizer. This issue is fixed in version 0.22.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-184",
              "description": "CWE-184: Incomplete List of Disallowed Inputs",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:25:47.539Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nuxt-content/mdc/security/advisories/GHSA-mxm6-v9r6-r94c",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nuxt-content/mdc/security/advisories/GHSA-mxm6-v9r6-r94c"
        },
        {
          "name": "https://github.com/nuxt-content/mdc/security/advisories/GHSA-mxm6-v9r6-r94c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt-content/mdc/security/advisories/GHSA-mxm6-v9r6-r94c"
        },
        {
          "name": "https://github.com/nuxt-content/mdc/pull/491",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt-content/mdc/pull/491"
        },
        {
          "name": "https://github.com/nuxt-content/mdc/commit/61d636c2983f021288e4fc5c4006733b38cf0d53",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt-content/mdc/commit/61d636c2983f021288e4fc5c4006733b38cf0d53"
        },
        {
          "name": "https://github.com/nuxt-content/mdc/releases/tag/v0.22.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt-content/mdc/releases/tag/v0.22.1"
        }
      ],
      "source": {
        "advisory": "GHSA-mxm6-v9r6-r94c",
        "discovery": "UNKNOWN"
      },
      "title": "@nuxtjs/mdc: the URL sanitizer misses SVG xlink:href and data:text/html, allowing XSS from untrusted markdown at the default configuration"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63671",
    "datePublished": "2026-09-16T14:25:47.539Z",
    "dateReserved": "2026-07-17T14:47:08.032Z",
    "dateUpdated": "2026-09-16T14:25:47.539Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-63671 (GCVE-0-2026-63671)

    Vulnerability from cvelistv5 – Published: 2026-09-16 14:25 – Updated: 2026-09-16 14:25
    VLAI
    Title
    @nuxtjs/mdc: the URL sanitizer misses SVG xlink:href and data:text/html, allowing XSS from untrusted markdown at the default configuration
    Summary
    MDC is a tool to take regular Markdown and write documents interacting deeply with a Vue component. Prior to 0.22.1, @nuxtjs/mdc uses parseMarkdown with allowDangerousHtml enabled by default and relies on validateProps, validateProp, and unsafeLinkPrefix to remove executable URLs from untrusted Markdown. validateProp checks only attributes named href or src, allowing an SVG xlink:href value represented as xLinkHref to retain a javascript: URL that executes in the page origin when selected. The data:text/html denylist entries are also compared against url.protocol, which is only data:, so an iframe src containing data:text/html survives sanitization and executes in an opaque origin when loaded. Plain href javascript: URLs, srcdoc, object, script, and base elements are already blocked, making these two paths specific sibling gaps in the sanitizer. This issue is fixed in version 0.22.1.
    Severity
    8.1 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    • CWE-184 - Incomplete List of Disallowed Inputs
    Assigner
    References
    Impacted products
    Vendor Product Version
    nuxt-content mdc Affected: < 0.22.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "mdc",
          "vendor": "nuxt-content",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.22.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "MDC is a tool to take regular Markdown and write documents interacting deeply with a Vue component. Prior to 0.22.1, @nuxtjs/mdc uses parseMarkdown with allowDangerousHtml enabled by default and relies on validateProps, validateProp, and unsafeLinkPrefix to remove executable URLs from untrusted Markdown. validateProp checks only attributes named href or src, allowing an SVG xlink:href value represented as xLinkHref to retain a javascript: URL that executes in the page origin when selected. The data:text/html denylist entries are also compared against url.protocol, which is only data:, so an iframe src containing data:text/html survives sanitization and executes in an opaque origin when loaded. Plain href javascript: URLs, srcdoc, object, script, and base elements are already blocked, making these two paths specific sibling gaps in the sanitizer. This issue is fixed in version 0.22.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-184",
              "description": "CWE-184: Incomplete List of Disallowed Inputs",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:25:47.539Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nuxt-content/mdc/security/advisories/GHSA-mxm6-v9r6-r94c",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nuxt-content/mdc/security/advisories/GHSA-mxm6-v9r6-r94c"
        },
        {
          "name": "https://github.com/nuxt-content/mdc/security/advisories/GHSA-mxm6-v9r6-r94c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt-content/mdc/security/advisories/GHSA-mxm6-v9r6-r94c"
        },
        {
          "name": "https://github.com/nuxt-content/mdc/pull/491",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt-content/mdc/pull/491"
        },
        {
          "name": "https://github.com/nuxt-content/mdc/commit/61d636c2983f021288e4fc5c4006733b38cf0d53",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt-content/mdc/commit/61d636c2983f021288e4fc5c4006733b38cf0d53"
        },
        {
          "name": "https://github.com/nuxt-content/mdc/releases/tag/v0.22.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nuxt-content/mdc/releases/tag/v0.22.1"
        }
      ],
      "source": {
        "advisory": "GHSA-mxm6-v9r6-r94c",
        "discovery": "UNKNOWN"
      },
      "title": "@nuxtjs/mdc: the URL sanitizer misses SVG xlink:href and data:text/html, allowing XSS from untrusted markdown at the default configuration"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63671",
    "datePublished": "2026-09-16T14:25:47.539Z",
    "dateReserved": "2026-07-17T14:47:08.032Z",
    "dateUpdated": "2026-09-16T14:25:47.539Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}