Vulnerability-Lookup

GHSA-P5J5-4J3Q-8MQ8

Vulnerability from github – Published: 2026-06-12 20:07 – Updated: 2026-06-12 20:07

Summary

TYPO3 HTML Sanitizer allows Cross-site Scripting

Details

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.

Credits to Doyensec in collaboration with Claude and Anthropic Research for reporting this vulnerability.

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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "typo3/html-sanitizer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-47345"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-12T20:07:46Z",
    "nvd_published_at": "2026-06-08T20:17:01Z",
    "severity": "MODERATE"
  },
  "details": "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.\n\nCredits to Doyensec in collaboration with Claude and Anthropic Research for reporting this vulnerability.",
  "id": "GHSA-p5j5-4j3q-8mq8",
  "modified": "2026-06-12T20:07:46Z",
  "published": "2026-06-12T20:07:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-p5j5-4j3q-8mq8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47345"
    },
    {
      "type": "WEB",
      "url": "https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47345.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/TYPO3/html-sanitizer"
    },
    {
      "type": "WEB",
      "url": "https://typo3.org/security/advisory/typo3-core-sa-2026-006"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "TYPO3 HTML Sanitizer allows Cross-site Scripting"
}

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

Vulnerability from cvelistv5 – Published: 2026-06-08 19:04 – Updated: 2026-06-08 19:49

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

TYPO3

References

2 references

URL	Tags
https://typo3.org/security/advisory/typo3-core-sa…	vendor-advisory
https://github.com/TYPO3/html-sanitizer/commit/8b…	patch

Impacted products

1 product

Vendor	Product	Version
TYPO3	HTML Sanitizer	Affected: 0 , < 2.3.2 (semver)

Date Public

2026-06-08 20:00

Credits

Doyensec in collaboration with Claude and Anthropic Research Benjamin Franzke

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-47345",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-08T19:49:44.787228Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-08T19:49:59.995Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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    "cna": {
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          "collectionURL": "https://packagist.org",
          "defaultStatus": "unaffected",
          "packageName": "typo3/html-sanitizer",
          "product": "HTML Sanitizer",
          "repo": "https://github.com/TYPO3/html-sanitizer",
          "vendor": "TYPO3",
          "versions": [
            {
              "lessThan": "2.3.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:typo3:html_sanitizer:*:*:*:*:*:*:*:*",
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                }
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          "value": "Benjamin Franzke"
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      "datePublic": "2026-06-08T20:00:00.000Z",
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          ],
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "vulnConfidentialityImpact": "NONE",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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        "dateUpdated": "2026-06-08T19:06:11.091Z",
        "orgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
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          "url": "https://typo3.org/security/advisory/typo3-core-sa-2026-006"
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          "tags": [
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          "url": "https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764"
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      "source": {
        "discovery": "UNKNOWN"
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      "title": "TYPO3 HTML Sanitizer allows Cross-Site Scripting",
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    "assignerShortName": "TYPO3",
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    "datePublished": "2026-06-08T19:04:08.337Z",
    "dateReserved": "2026-05-19T12:49:25.966Z",
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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-P5J5-4J3Q-8MQ8

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

Tags

Sightings

Nomenclature