{"id":"CVE-2026-113661","aliases":["CLSA-2026-1793810745","EUVD-2026-105209","GHSA-cv27-6wvh-8x7j"],"status":"published","title":"ApostropheCMS: Incomplete CVE-2026-53606: `meta http-equiv=refresh` `content` still ships `javascript:` / `data:` URLs","description":"ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Prior to sanitize-html 2.18.0, a non-default configuration that allows meta refresh elements and their http-equiv and content attributes can retain unsafe script or redirect destinations embedded in the refresh content value. This issue is fixed in sanitize-html 2.18.0.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00263,"percentile":0.18272,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-10-20T17:11:20Z","modified":"2026-11-04T19:00:37Z","fixes":[{"ecosystem":"npm","package":"sanitize-html","fixed_in":["2.18.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"sanitize-html","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.18.0"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"sanitize-html","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.27.5-tuxcare.0"},{"fixed":"1.27.5-tuxcare.8"}]}],"versions":["1.27.5","1.27.5-tuxcare.1","1.27.5-tuxcare.2","1.27.5-tuxcare.3","1.27.5-tuxcare.4","1.27.5-tuxcare.5","1.27.5-tuxcare.6","1.27.5-tuxcare.7"],"bundled":2},{"source":"osv","ecosystem":"npm","package":"sanitize-html","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.18.0"}]}]}],"products":[{"vendor":"apostrophecms","product":"apostrophe"},{"vendor":"apostrophecms","product":"sanitize-html"}],"references":[{"url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-cv27-6wvh-8x7j","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/apostrophecms/apostrophe/releases/tag/sanitize-html@2.18.0","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/advisories/GHSA-cv27-6wvh-8x7j"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/113xxx/CVE-2026-113661.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113661","tags":["advisory"]},{"url":"https://github.com/apostrophecms/apostrophe","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-113661","title":"ApostropheCMS: Incomplete CVE-2026-53606: `meta http-equiv=refresh` `content` still ships `javascript:` / `data:` URLs","description":"ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Prior to sanitize-html 2.18.0, a non-default configuration that allows meta refresh elements and their http-equiv and content attributes can retain unsafe script or redirect destinations embedded in the refresh content value. This issue is fixed in sanitize-html 2.18.0.","status":"published","published":"2026-10-20T17:11:20.577Z","modified":"2026-10-21T15:53:24.98Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:44:40.64332Z"}],"euvd":[{"id":"EUVD-2026-105209","description":"ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Prior to sanitize-html 2.18.0, a non-default configuration that allows meta refresh elements and their http-equiv and content attributes can retain unsafe script or redirect destinations embedded in the refresh content value. This issue is fixed in sanitize-html 2.18.0.","status":"published","published":"2026-10-20T17:11:20Z","modified":"2026-10-21T15:53:24Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:59:36.721365Z"}],"ghsa":[{"id":"GHSA-cv27-6wvh-8x7j","title":"ApostropheCMS: Incomplete CVE-2026-53606: `meta http-equiv=refresh` `content` still ships `javascript:` / `data:` URLs","description":"### Summary\n\nCVE-2026-53606 expanded `allowedSchemesAppliedToAttributes` so named URL attributes (`action`, `formaction`, `data`, `poster`, `background`, later `ping`, `xlink:href`, …) go through `naughtyHref()`. A **URL nested inside `meta` `content`** (`http-equiv=refresh`) is not an attribute name on that list, so the embedded destination is never scheme-checked.\n\nDefault `allowedTags` still omit `meta`. Same non-default integrator config as 53606: allow `meta` plus `http-equiv` / `content`.\n\nOn **2.17.7**:\n\n```text\nsanitizeHtml(\n  '\u003cmeta http-equiv=\"refresh\" content=\"0;url=javascript:alert(1)\"\u003e',\n  { allowedTags: ['meta'], allowedAttributes: { meta: ['http-equiv', 'content'] } }\n)\n// =\u003e \u003cmeta http-equiv=\"refresh\" content=\"0;url=javascript:alert(1)\" /\u003e\n```\n\n`data:text/html,…` and arbitrary `https:` destinations also survive. `formaction=\"javascript:…\"` (53606) is stripped.\n\nPlease **Request CVE**. Credit: Finder + Reporter (`adrbogacz`).\n\n### Details\n\n`naughtyHref()` only runs when the attribute name is in `allowedSchemesAppliedToAttributes` (`index.js` ~385). Refresh URLs live in a `content` value of the form `0;url=…`, so the gate never fires. Adding `content` to that list wholesale would break ordinary meta `content` (description, viewport).\n\n**Fix:** when `http-equiv` is `refresh` (case-insensitive), parse the `; url=` destination and run `naughtyHref('meta', url)`. Drop `content` (or the tag) if the URL is rejected. Leave other `meta` `content` values alone.\n\n### PoC\n\nLocal `sanitize-html@2.17.7`. Output inspection only:\n\n```text\nnode -e '\nconst sanitize = require(\"sanitize-html\");\nconst opts = { allowedTags: [\"meta\"], allowedAttributes: { meta: [\"http-equiv\", \"content\"] } };\nfor (const html of [\n  \"\u003cmeta http-equiv=\\\"refresh\\\" content=\\\"0;url=javascript:alert(1)\\\"\u003e\",\n  \"\u003cmeta http-equiv=\\\"refresh\\\" content=\\\"0;url=data:text/html,aaa\\\"\u003e\",\n  \"\u003cform\u003e\u003cbutton formaction=\\\"javascript:alert(1)\\\"\u003ex\u003c/button\u003e\u003c/form\u003e\",\n]) {\n  console.log(html, \"=\u003e\", sanitize(html, html.includes(\"meta\") ? opts : { allowedTags: [\"form\",\"button\"], allowedAttributes: { button: [\"formaction\"] } }));\n}\n'\n```\n\nExpected: refresh `javascript:` / `data:` remain; 53606 `formaction` is removed. Do not attach a browser hang or stored-XSS page.\n\n### Impact\n\nAn integrator who allowed `meta` + `content` expecting `allowedSchemes` to apply (the 53606 configuration pattern) still emits a refresh to `javascript:`, `data:`, or an attacker `https:` URL. Stored XSS / open redirect for viewers of that HTML. Default config is not affected.","status":"published","published":"2026-10-20T18:15:33Z","modified":"2026-10-20T18:15:34Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:41:33.669646Z"}],"nvd":[{"id":"CVE-2026-113661","description":"ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Prior to sanitize-html 2.18.0, a non-default configuration that allows meta refresh elements and their http-equiv and content attributes can retain unsafe script or redirect destinations embedded in the refresh content value. This issue is fixed in sanitize-html 2.18.0.","status":"published","published":"2026-10-20T18:17:19.563Z","modified":"2026-10-21T16:17:24.223Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:13:01.161484Z"}],"osv":[{"id":"CVE-2026-113661","title":"ApostropheCMS: Incomplete CVE-2026-53606: `meta http-equiv=refresh` `content` still ships `javascript:` / `data:` URLs","description":"ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Prior to sanitize-html 2.18.0, a non-default configuration that allows meta refresh elements and their http-equiv and content attributes can retain unsafe script or redirect destinations embedded in the refresh content value. This issue is fixed in sanitize-html 2.18.0.","status":"published","published":"2026-10-20T17:11:20.577Z","modified":"2026-11-11T10:47:24.936833911Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-11T03:22:00.901153Z"},{"id":"GHSA-cv27-6wvh-8x7j","title":"ApostropheCMS: Incomplete CVE-2026-53606: `meta http-equiv=refresh` `content` still ships `javascript:` / `data:` URLs","description":"### Summary\n\nCVE-2026-53606 expanded `allowedSchemesAppliedToAttributes` so named URL attributes (`action`, `formaction`, `data`, `poster`, `background`, later `ping`, `xlink:href`, …) go through `naughtyHref()`. A **URL nested inside `meta` `content`** (`http-equiv=refresh`) is not an attribute name on that list, so the embedded destination is never scheme-checked.\n\nDefault `allowedTags` still omit `meta`. Same non-default integrator config as 53606: allow `meta` plus `http-equiv` / `content`.\n\nOn **2.17.7**:\n\n```text\nsanitizeHtml(\n  '\u003cmeta http-equiv=\"refresh\" content=\"0;url=javascript:alert(1)\"\u003e',\n  { allowedTags: ['meta'], allowedAttributes: { meta: ['http-equiv', 'content'] } }\n)\n// =\u003e \u003cmeta http-equiv=\"refresh\" content=\"0;url=javascript:alert(1)\" /\u003e\n```\n\n`data:text/html,…` and arbitrary `https:` destinations also survive. `formaction=\"javascript:…\"` (53606) is stripped.\n\nPlease **Request CVE**. Credit: Finder + Reporter (`adrbogacz`).\n\n### Details\n\n`naughtyHref()` only runs when the attribute name is in `allowedSchemesAppliedToAttributes` (`index.js` ~385). Refresh URLs live in a `content` value of the form `0;url=…`, so the gate never fires. Adding `content` to that list wholesale would break ordinary meta `content` (description, viewport).\n\n**Fix:** when `http-equiv` is `refresh` (case-insensitive), parse the `; url=` destination and run `naughtyHref('meta', url)`. Drop `content` (or the tag) if the URL is rejected. Leave other `meta` `content` values alone.\n\n### PoC\n\nLocal `sanitize-html@2.17.7`. Output inspection only:\n\n```text\nnode -e '\nconst sanitize = require(\"sanitize-html\");\nconst opts = { allowedTags: [\"meta\"], allowedAttributes: { meta: [\"http-equiv\", \"content\"] } };\nfor (const html of [\n  \"\u003cmeta http-equiv=\\\"refresh\\\" content=\\\"0;url=javascript:alert(1)\\\"\u003e\",\n  \"\u003cmeta http-equiv=\\\"refresh\\\" content=\\\"0;url=data:text/html,aaa\\\"\u003e\",\n  \"\u003cform\u003e\u003cbutton formaction=\\\"javascript:alert(1)\\\"\u003ex\u003c/button\u003e\u003c/form\u003e\",\n]) {\n  console.log(html, \"=\u003e\", sanitize(html, html.includes(\"meta\") ? opts : { allowedTags: [\"form\",\"button\"], allowedAttributes: { button: [\"formaction\"] } }));\n}\n'\n```\n\nExpected: refresh `javascript:` / `data:` remain; 53606 `formaction` is removed. Do not attach a browser hang or stored-XSS page.\n\n### Impact\n\nAn integrator who allowed `meta` + `content` expecting `allowedSchemes` to apply (the 53606 configuration pattern) still emits a refresh to `javascript:`, `data:`, or an attacker `https:` URL. Stored XSS / open redirect for viewers of that HTML. Default config is not affected.","status":"published","published":"2026-10-20T18:15:33Z","modified":"2026-10-20T18:30:03.592709324Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:45.639885Z"},{"id":"CLSA-2026-1793810745","title":"TuxCare security update for sanitize-html (2 CVEs)","description":"TuxCare rebuilt sanitize-html to address 2 CVEs. Fixed in 1.27.5-tuxcare.8.","status":"published","published":"2026-11-04T17:45:46Z","modified":"2026-11-04T19:00:37.295303512Z","updated_at":"2026-11-04T19:15:03.6858Z"}]}}