GHSA-WFV2-PWC8-CRG5

Vulnerability from github – Published: 2026-03-17 17:07 – Updated: 2026-03-17 17:07
VLAI?
Summary
jsPDF has HTML Injection in New Window paths
Details

Impact

User control of the options argument of the output function allows attackers to inject arbitrary HTML (such as scripts) into the browser context the created PDF is opened in. The affected overloads and options are:

  • "pdfobjectnewwindow": the pdfObjectUrl option and the entire options object, which is JSON-serialized and included verbatim in the generated HTML-string.
  • "pdfjsnewwindow": the pdfJsUrl and filename options
  • "dataurlnewwindow": the filename option

The vulnerability can be exploited in the following scenario: the attacker provides values for the output options, for example via a web interface. These values are then passed unsanitized (automatically or semi-automatically) to the attack victim. The victim creates and opens a PDF with the attack vector using one of the vulnerable method overloads inside their browser. The attacker can thus inject scripts that run in the victims browser context and can extract or modify secrets from this context.

Example attack vector:

import { jsPDF } from 'jspdf';
const doc = new jsPDF();

const payload =  'x\"></iframe><script>window.__n=1</script><iframe src="';

doc.output('pdfjsnewwindow', {
  filename: payload,
  pdfJsUrl: 'viewer.html'
});

Patches

The vulnerability has been fixed in jspdf@4.2.1.

Workarounds

Sanitize user input before passing it to the output method.

Severity ?
9.6 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "jspdf"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-31938"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-17T17:07:59Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### Impact\n\nUser control of the `options` argument of the `output` function allows attackers to inject arbitrary HTML (such as scripts) into the browser context the created PDF is opened in. The affected overloads and options are:\n\n* `\"pdfobjectnewwindow\"`: the `pdfObjectUrl` option and the entire options object, which is JSON-serialized and included verbatim in the generated HTML-string.\n* `\"pdfjsnewwindow\"`: the `pdfJsUrl` and `filename` options\n* `\"dataurlnewwindow\"`: the `filename` option\n\nThe vulnerability can be exploited in the following scenario: the attacker provides values for the output options, for example via a web interface. These values are then passed unsanitized (automatically or semi-automatically) to the attack victim. The victim creates and opens a PDF with the attack vector using one of the vulnerable method overloads inside their browser. The attacker can thus inject scripts that run in the victims browser context and can extract or modify secrets from this context.\n\nExample attack vector:\n\n```js\nimport { jsPDF } from \u0027jspdf\u0027;\nconst doc = new jsPDF();\n\nconst payload =  \u0027x\\\"\u003e\u003c/iframe\u003e\u003cscript\u003ewindow.__n=1\u003c/script\u003e\u003ciframe src=\"\u0027;\n\ndoc.output(\u0027pdfjsnewwindow\u0027, {\n  filename: payload,\n  pdfJsUrl: \u0027viewer.html\u0027\n});\n```\n\n### Patches\nThe vulnerability has been fixed in jspdf@4.2.1.\n\n### Workarounds\nSanitize user input before passing it to the output method.",
  "id": "GHSA-wfv2-pwc8-crg5",
  "modified": "2026-03-17T17:07:59Z",
  "published": "2026-03-17T17:07:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/parallax/jsPDF/security/advisories/GHSA-wfv2-pwc8-crg5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/parallax/jsPDF/commit/87a40bbd07e6b30575196370670b41f264aa78d7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/parallax/jsPDF"
    },
    {
      "type": "WEB",
      "url": "https://github.com/parallax/jsPDF/releases/tag/v4.2.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "jsPDF has HTML Injection in New Window paths"
}


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  • 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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