{"id":"GHSA-83rm-6c8r-g728","revision":"91116d5c61654d3ead191da90be4a38f","records":[{"revision":"91116d5c61654d3ead191da90be4a38f","observedAt":"2026-10-28T21:55:29.474+00:00","statement":{"source":"osv","id":"GHSA-83rm-6c8r-g728","aliases":["CVE-2026-118257"],"title":"Vue I18n: escapeParameter does not prevent XSS through srcdoc in translation messages","description":"### Summary\n\nWhen `escapeParameter` is enabled (`escapeParameterHtml` in the Legacy API), Vue I18n passes the translated string through `sanitizeTranslatedHtml()`. The sanitizer escapes `<` and `>` in attribute values and neutralizes event handler attributes such as `onerror`, but it does not handle the `srcdoc` attribute of `<iframe>`.\n\nThe value of `srcdoc` is an HTML document: the browser decodes the character references in it and parses the result as a nested document in the same origin. The escaping and the neutralization done by the sanitizer are both character references, so they are undone inside `srcdoc`. This bypasses the fix for CVE-2025-53892 (GHSA-x8qp-wqqm-57ph).\n\n### Details\n\n`sanitizeTranslatedHtml()` ([`packages/shared/src/sanitize.ts` in v11.4.13](https://github.com/intlify/vue-i18n/blob/v11.4.13/packages/shared/src/sanitize.ts#L126-L162)) works on the final translated string:\n\n1. It escapes `<`, `>`, `\"` and `'` inside quoted attribute values.\n2. It rewrites the `on` of event handler attributes to `&#111;n`.\n3. It replaces `javascript:` URLs in `href`, `src`, `action` and `formaction` with `about:blank`.\n\nInside `srcdoc`, steps 1 and 2 only produce character references, which the browser decodes before parsing the value as a document. Markup inside `srcdoc` therefore survives the sanitizer, with escaping or without it.\n\nThis can be reached in three ways:\n\n- **A parameter inside `srcdoc`.** With a message such as `<iframe srcdoc=\"{content}\"></iframe>`, `escapeParameter` escapes `content` into character references, and the browser decodes them again.\n- **Markup in a message.** A message that contains an `<iframe srcdoc=\"...\">` keeps it after sanitizing. The documentation asks not to use HTML messages with content from users, but it also says that the sanitizer neutralizes event handlers in the final HTML.\n- **Together with GHSA-8rc2-428q-7ww3.** When a call passes a list and named values, the named values are not escaped. An `<iframe srcdoc=\"...\">` in a named value then reaches the sanitizer as markup, even with an ordinary message such as `{0} {name}`.\n\n### PoC\n\n```js\nimport { createI18n } from 'vue-i18n'\n\nconst i18n = createI18n({\n  legacy: false,\n  locale: 'en',\n  escapeParameter: true,\n  messages: {\n    en: { message: '<iframe srcdoc=\"<b>x</b>\"></iframe>' }\n  }\n})\n\nconsole.log(i18n.global.t('message'))\n// v11.4.13: <iframe srcdoc=\"&lt;b&gt;x&lt;/b&gt;\"></iframe>\n```\n\nThe browser decodes the value and renders `<b>x</b>` as a separate document inside the `<iframe>`, in the same origin as the page. Any markup in that position is parsed the same way.\n\n### Impact\n\nApplications are affected when they enable `escapeParameter`, render translations as HTML (for example with `v-html`), and one of the following applies:\n\n- an untrusted value is passed as a parameter that the message places inside `srcdoc`,\n- message content is not fully trusted (for example crowdsourced or stored translations), or\n- untrusted named values are passed in the same call as a list (GHSA-8rc2-428q-7ww3).\n\nAn attacker can then run script in the origin of the application (DOM-based XSS), despite the sanitizer.\n\nRendering through `<i18n-t>` is not affected, since it does not render translations as HTML.\n\n### Patches\n\nFixed in 11.4.14 and 12.0.0-alpha.5. The sanitizer now neutralizes the `srcdoc` attribute itself, in the same way as event handler attributes.\n\nv9 and v10 are no longer supported and will not be fixed. Please migrate to v11.\n\n### Workarounds\n\n- Do not render translations that can contain untrusted content with `v-html`. Use component interpolation (`<i18n-t>`) instead.\n- Do not put `srcdoc` in translation messages, and do not pass values into it.\n\n### References\n\n- [CWE-79](https://cwe.mitre.org/data/definitions/79.html), [CWE-116](https://cwe.mitre.org/data/definitions/116.html)\n- [GHSA-x8qp-wqqm-57ph](https://github.com/intlify/vue-i18n/security/advisories/GHSA-x8qp-wqqm-57ph) (CVE-2025-53892): the fix that added `sanitizeTranslatedHtml()`\n- [GHSA-8rc2-428q-7ww3](https://github.com/intlify/vue-i18n/security/advisories/GHSA-8rc2-428q-7ww3): named values are not escaped when a list is also passed\n- [HTML Standard: the `srcdoc` attribute](https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-srcdoc)","state":0,"publishedAt":"2026-10-28T21:06:24+00:00","modifiedAt":"2026-10-28T21:15:05.5689309+00:00","affected":[{"ecosystem":"npm","name":"vue-i18n","ranges":[],"versions":["9.14.5"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"vue-i18n","ranges":[],"versions":["10.0.8"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"vue-i18n","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"11.1.10"},{"kind":"fixed","version":"11.4.14"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"vue-i18n","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"12.0.0-alpha.4"},{"kind":"fixed","version":"12.0.0-alpha.5"}]}],"versions":["12.0.0-alpha.4"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"petite-vue-i18n","ranges":[],"versions":["9.14.5"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"petite-vue-i18n","ranges":[],"versions":["10.0.8"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"petite-vue-i18n","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"11.1.10"},{"kind":"fixed","version":"11.4.14"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"petite-vue-i18n","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"12.0.0-alpha.4"},{"kind":"fixed","version":"12.0.0-alpha.5"}]}],"versions":["12.0.0-alpha.4"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/core-base","ranges":[],"versions":["9.14.5"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/core-base","ranges":[],"versions":["10.0.8"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/core-base","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"11.1.10"},{"kind":"fixed","version":"11.4.14"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/core-base","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"12.0.0-alpha.4"},{"kind":"fixed","version":"12.0.0-alpha.5"}]}],"versions":["12.0.0-alpha.4"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/core","ranges":[],"versions":["9.14.5"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/core","ranges":[],"versions":["10.0.8"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/core","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"11.1.10"},{"kind":"fixed","version":"11.4.14"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/core","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"12.0.0-alpha.4"},{"kind":"fixed","version":"12.0.0-alpha.5"}]}],"versions":["12.0.0-alpha.4"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/vue-i18n-core","ranges":[],"versions":["9.14.5"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/vue-i18n-core","ranges":[],"versions":["10.0.8"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/vue-i18n-core","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"11.1.10"},{"kind":"fixed","version":"11.4.14"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/vue-i18n-core","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"12.0.0-alpha.4"},{"kind":"fixed","version":"12.0.0-alpha.5"}]}],"versions":["12.0.0-alpha.4"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/shared","ranges":[],"versions":["9.14.5"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/shared","ranges":[],"versions":["10.0.8"],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/shared","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"11.1.10"},{"kind":"fixed","version":"11.4.14"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@intlify/shared","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"12.0.0-alpha.4"},{"kind":"fixed","version":"12.0.0-alpha.5"}]}],"versions":["12.0.0-alpha.4"],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/intlify/vue-i18n/security/advisories/GHSA-83rm-6c8r-g728","https://github.com/intlify/vue-i18n/pull/2679","https://github.com/intlify/vue-i18n/commit/43391d20e7c85403cb59bdb21b5d542819f54042","https://github.com/intlify/vue-i18n","https://github.com/intlify/vue-i18n/releases/tag/v11.4.14","https://github.com/intlify/vue-i18n/releases/tag/v12.0.0-alpha.5"],"sourceUrl":"https://github.com/advisories/GHSA-83rm-6c8r-g728","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-83rm-6c8r-g728","identifiers":["GHSA-83rm-6c8r-g728","CVE-2026-118257"]},"retained":false,"historicalAffected":[]}],"coverage":[]}