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    4 vulnerabilities found for HTML Sanitizer by TYPO3

    CVE-2026-47345 (GCVE-0-2026-47345)

    Vulnerability from nvd – Published: 2026-06-08 19:04 – Updated: 2026-06-08 19:49
    VLAI
    Title
    TYPO3 HTML Sanitizer allows Cross-Site Scripting
    Summary
    Namespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.
    Severity
    5.1 (Medium)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    Assigner
    References
    Impacted products
    Vendor Product Version
    TYPO3 HTML Sanitizer Affected: 0 , < 2.3.2 (semver)
    		Create a notification for this product.
    Date Public
    2026-06-08 20:00
    Credits
    Doyensec in collaboration with Claude and Anthropic Research Benjamin Franzke
    Show details on NVD website
    To clipboard 

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    CVE-2026-47344 (GCVE-0-2026-47344)

    Vulnerability from nvd – Published: 2026-06-08 19:03 – Updated: 2026-06-08 19:50
    VLAI
    Title
    TYPO3 HTML Sanitizer allows Cross-Site Scripting
    Summary
    When ALLOW_INSECURE_RAW_TEXT is enabled, whitespace-variant closing tags (e.g., </style\t>) are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.
    Severity
    2.1 (Low)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    • CWE-436 - Interpretation Conflict
    Assigner
    References
    Impacted products
    Vendor Product Version
    TYPO3 HTML Sanitizer Affected: 0 , < 2.3.2 (semver)
    		Create a notification for this product.
    Date Public
    2026-06-08 20:00
    Credits
    IPC Labs Oliver Hader
    Show details on NVD website
    To clipboard 

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    CVE-2026-47345 (GCVE-0-2026-47345)

    Vulnerability from cvelistv5 – Published: 2026-06-08 19:04 – Updated: 2026-06-08 19:49
    VLAI
    Title
    TYPO3 HTML Sanitizer allows Cross-Site Scripting
    Summary
    Namespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.
    Severity
    5.1 (Medium)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    Assigner
    References
    Impacted products
    Vendor Product Version
    TYPO3 HTML Sanitizer Affected: 0 , < 2.3.2 (semver)
    		Create a notification for this product.
    Date Public
    2026-06-08 20:00
    Credits
    Doyensec in collaboration with Claude and Anthropic Research Benjamin Franzke
    Show details on NVD website
    To clipboard 

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    CVE-2026-47344 (GCVE-0-2026-47344)

    Vulnerability from cvelistv5 – Published: 2026-06-08 19:03 – Updated: 2026-06-08 19:50
    VLAI
    Title
    TYPO3 HTML Sanitizer allows Cross-Site Scripting
    Summary
    When ALLOW_INSECURE_RAW_TEXT is enabled, whitespace-variant closing tags (e.g., </style\t>) are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.
    Severity
    2.1 (Low)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    • CWE-436 - Interpretation Conflict
    Assigner
    References
    Impacted products
    Vendor Product Version
    TYPO3 HTML Sanitizer Affected: 0 , < 2.3.2 (semver)
    		Create a notification for this product.
    Date Public
    2026-06-08 20:00
    Credits
    IPC Labs Oliver Hader
    Show details on NVD website
    To clipboard 

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        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://packagist.org",
          "defaultStatus": "unaffected",
          "packageName": "typo3/html-sanitizer",
          "product": "HTML Sanitizer",
          "repo": "https://github.com/TYPO3/html-sanitizer",
          "vendor": "TYPO3",
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              "lessThan": "2.3.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:a:typo3:html_sanitizer:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "2.3.2",
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              ],
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              "operator": "OR"
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          ],
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        }
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        {
          "lang": "en",
          "type": "reporter",
          "value": "IPC Labs"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Oliver Hader"
        }
      ],
      "datePublic": "2026-06-08T20:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "When \u003ccode\u003eALLOW_INSECURE_RAW_TEXT\u003c/code\u003e is enabled, whitespace-variant closing tags (e.g., \u003ccode\u003e\u0026lt;/style\\t\u0026gt;\u003c/code\u003e) are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of \u003ccode\u003etypo3/html-sanitizer\u003c/code\u003e before version 2.3.2."
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          ],
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        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2.1,
            "baseSeverity": "LOW",
            "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:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
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            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-436",
              "description": "CWE-436 Interpretation Conflict",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-08T19:03:19.826Z",
        "orgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
        "shortName": "TYPO3"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://typo3.org/security/advisory/typo3-core-sa-2026-006"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5a5f67f1120ec41084e9c1a0675641c"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "TYPO3 HTML Sanitizer allows Cross-Site Scripting",
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    "cveId": "CVE-2026-47344",
    "datePublished": "2026-06-08T19:03:19.826Z",
    "dateReserved": "2026-05-19T12:49:25.966Z",
    "dateUpdated": "2026-06-08T19:50:47.479Z",
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}