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'selected' : ''}>${option}</option>`,\n  )\n  .join('');\n```\n\nThe `option` values come from `schema.options`, which is an array of strings defined in the template JSON. These values are interpolated directly into the HTML string without any escaping of `<`, `>`, `\"`, `&`, or other HTML-special characters. An option value containing `\">` breaks out of the `value` attribute and allows injection of arbitrary HTML elements and event handlers.\n\n## Proof of Concept\n\nLoading the following template into a pdfme Form or Designer component triggers JavaScript execution:\n\n```json\n{\n  \"basePdf\": { \"width\": 210, \"height\": 297, \"padding\": [20, 20, 20, 20] },\n  \"schemas\": [[\n    {\n      \"name\": \"malicious_select\",\n      \"type\": \"select\",\n      \"content\": \"Normal\",\n      \"options\": [\n        \"Normal\",\n        \"\\\"></option><img src=x onerror=\\\"alert(document.domain)\\\">\"\n      ],\n      \"position\": { \"x\": 20, \"y\": 20 },\n      \"width\": 80,\n      \"height\": 10\n    }\n  ]]\n}\n```\n\nThe injected `<img onerror>` element executes JavaScript because it is parsed as HTML when assigned to `selectElement.innerHTML`.\n\n## Attack Vectors\n\nThe `options` array is defined in the template (not by form-filling end users). The attack requires a malicious template to be loaded, which can happen via:\n1. File upload (e.g., \"Load Template\" functionality in applications)\n2. Shared/imported templates in multi-tenant applications\n3. Templates stored in databases without content sanitization\n4. The `updateTemplate()` API being called with untrusted data\n\nThis vulnerability is triggered in Form mode (for non-readOnly select fields) and Designer mode when the select element is rendered.\n\n## Impact\n\nAn attacker who can supply a malicious template can execute arbitrary JavaScript in the browser of any user who views or interacts with the template. This enables:\n- Session hijacking via cookie/token theft\n- Keylogging of form input data\n- Phishing and page modification\n- Data exfiltration\n\n## Suggested Fix\n\nUse DOM APIs to create option elements safely instead of string interpolation:\n\n```typescript\noptions.forEach((option) => {\n  const optionEl = document.createElement('option');\n  optionEl.value = option;\n  optionEl.textContent = option;\n  if (option === value) optionEl.selected = true;\n  selectElement.appendChild(optionEl);\n});\n```\n\nAlternatively, HTML-encode option values before interpolation:\n```typescript\nconst escape = (s) => s.replace(/&/g, '&amp;').replace(/\"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;');\n```","state":0,"publishedAt":"2026-03-18T16:10:16+00:00","modifiedAt":"2026-09-01T03:55:42.9185122+00:00","affected":[{"ecosystem":"npm","name":"@pdfme/schemas","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"5.5.9"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/pdfme/pdfme/security/advisories/GHSA-qq9g-96v4-m3cj","https://github.com/pdfme/pdfme"],"sourceUrl":"https://github.com/advisories/GHSA-qq9g-96v4-m3cj","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-qq9g-96v4-m3cj","identifiers":["GHSA-qq9g-96v4-m3cj","CVE-2026-82867"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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