CVE-2026-66370

{"id": "CVE-2026-66370", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-66370", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-06T15:42:03.803831Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 4.8, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "affectedData": [{"cpes": ["cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"], "repo": "https://github.com/rrrene/html_sanitize_ex", "vendor": "rrrene", "modules": ["Elixir.HtmlSanitizeEx.Scrubber.HTML5", "Elixir.HtmlSanitizeEx"], "product": "html_sanitize_ex", "versions": [{"status": "affected", "version": "0.3.1", "lessThan": "1.4.5", "versionType": "semver"}, {"status": "affected", "version": "1.5.0-rc.0", "lessThan": "1.5.3", "versionType": "semver"}], "packageURL": "pkg:hex/html_sanitize_ex", "packageName": "html_sanitize_ex", "programFiles": ["lib/html_sanitize_ex/scrubber/html5.ex", "lib/html_sanitize_ex.ex"], "collectionURL": "https://repo.hex.pm", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.HtmlSanitizeEx.Scrubber.HTML5':scrub_attribute/2"}, {"name": "'Elixir.HtmlSanitizeEx.Scrubber.HTML5':sanitize/1"}, {"name": "'Elixir.HtmlSanitizeEx':html5/1"}]}, {"cpes": ["cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"], "repo": "https://github.com/rrrene/html_sanitize_ex", "vendor": "rrrene", "modules": ["Elixir.HtmlSanitizeEx.Scrubber.HTML5", "Elixir.HtmlSanitizeEx"], "product": "html_sanitize_ex", "versions": [{"status": "affected", "changes": [{"at": "a1e804ed997e780ea71d14393cf2f701330553a6", "status": "unaffected"}, {"at": "21394e758cb0ffe12fb9953c30fdedc6016c8f9e", "status": "unaffected"}], "version": "8976d64ea0b77d26093a94a43ec48a3978e8d028", "lessThan": "*", "versionType": "git"}], "packageURL": "pkg:github/rrrene/html_sanitize_ex", "packageName": "rrrene/html_sanitize_ex", "programFiles": ["lib/html_sanitize_ex/scrubber/html5.ex", "lib/html_sanitize_ex.ex"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.HtmlSanitizeEx.Scrubber.HTML5':scrub_attribute/2"}, {"name": "'Elixir.HtmlSanitizeEx.Scrubber.HTML5':sanitize/1"}, {"name": "'Elixir.HtmlSanitizeEx':html5/1"}]}]}], "published": "2026-08-06T16:16:48.420", "references": [{"url": "https://cna.erlef.org/cves/CVE-2026-66370.html", "tags": ["Patch", "Third Party Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/rrrene/html_sanitize_ex/commit/21394e758cb0ffe12fb9953c30fdedc6016c8f9e", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/rrrene/html_sanitize_ex/commit/a1e804ed997e780ea71d14393cf2f701330553a6", "tags": ["Patch"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-w3f9-jjhw-wwvq", "tags": ["Broken Link"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-66370", "tags": ["Patch", "Third Party Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "description": [{"lang": "en", "value": "CWE-601"}]}], "descriptions": [{"lang": "en", "value": "URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to retarget a form already on the rendering page and receive whatever the victim submits, including credentials, via the form and formaction attributes on an <input> element in sanitized HTML. HTML's form attribute associates an input with any form on the page by its id even when the input sits outside that form, and formaction on a submit control overrides the owning form's action. Neither attribute receives a scheme check, so an absolute cross-origin URL survives sanitizing.\n\nNo script executes. The scrubber allows neither form nor button, so the attacker cannot introduce a form of their own and the rendering page must already contain a form carrying an id.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3."}, {"lang": "es", "value": "La vulnerabilidad de redirecci\u00f3n de URL a sitio no confiable (\u2019redirecci\u00f3n abierta\u2019) en el depurador HTML5 en rrrene html_sanitize_ex permite a un atacante remoto no autenticado redirigir un formulario ya presente en la p\u00e1gina de renderizado y recibir lo que la v\u00edctima env\u00ede, incluidas las credenciales, a trav\u00e9s de los atributos form y formaction en un elemento [input] en HTML saneado. El atributo form de HTML asocia una entrada con cualquier formulario en la p\u00e1gina por su id incluso cuando la entrada se encuentra fuera de ese formulario, y formaction en un control de env\u00edo anula la acci\u00f3n del formulario propietario. Ninguno de los atributos recibe una verificaci\u00f3n de esquema, por lo que una URL absoluta de origen cruzado sobrevive al saneamiento.\n\nNo se ejecuta ning\u00fan script. El depurador no permite ni form ni button, por lo que el atacante no puede introducir un formulario propio y la p\u00e1gina de renderizado ya debe contener un formulario con un id.\n\nEste problema afecta a html_sanitize_ex: desde 0.3.1 antes de 1.5.3."}], "lastModified": "2026-10-24T16:10:00.153", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:rrrene:htmlsanitizeex:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DE85053C-AE84-4570-A90C-4D4CCD7A4BA3", "versionEndExcluding": "1.5.3", "versionStartIncluding": "0.3.1"}], "operator": "OR"}]}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}