CVE-2026-66829

{"id": "CVE-2026-66829", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-66829", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-06T15:42:40.366099Z"}}], "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": 2.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "LOW", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/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": "PASSIVE", "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": "NONE", "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": "9f7e38be51edc38f132dfe994f37af5cf5e0e76f", "status": "unaffected"}, {"at": "29454dc99513fd9b5b6429ab7b6695ad09889227", "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": "2026-08-06T16:16:49.450", "references": [{"url": "https://cna.erlef.org/cves/CVE-2026-66829.html", "tags": ["Patch", "Third Party Advisory"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/rrrene/html_sanitize_ex/commit/29454dc99513fd9b5b6429ab7b6695ad09889227", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/rrrene/html_sanitize_ex/commit/9f7e38be51edc38f132dfe994f37af5cf5e0e76f", "tags": ["Patch"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-2c6f-3j54-xpcr", "tags": ["Broken Link"], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-66829", "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 a remote attacker to force visitors of a page to navigate to a site of the attacker's choosing via a <meta http-equiv=\"refresh\"> element in sanitized HTML. HtmlSanitizeEx.html5/1 keeps attacker-supplied <meta> elements in its output. A meta element acts on the whole document rather than on the fragment it was embedded in, so it can also declare document-wide directives such as Content-Security-Policy.\n\nThis is not cross-site scripting. Browsers do not navigate a meta refresh to a javascript: URL, so the uppercase JAVASCRIPT: filter bypass yields no script execution and none was demonstrated.\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 de rrrene html_sanitize_ex permite a un atacante remoto forzar a los visitantes de una p\u00e1gina a navegar a un sitio elegido por el atacante a trav\u00e9s de un elemento menor quemeta http-equiv=\u201crefresh\u201dmayor que en HTML saneado. HtmlSanitizeEx.html5/1 mantiene los elementos [meta] proporcionados por el atacante en su salida. Un elemento meta act\u00faa sobre todo el documento en lugar de sobre el fragmento en el que fue incrustado, por lo que tambi\u00e9n puede declarar directivas a nivel de documento como Content-Security-Policy.\n\nEsto no es cross-site scripting. Los navegadores no navegan una meta refresh a una URL javascript_disabled: , por lo que el bypass del filtro javascript_disabled: en may\u00fasculas no produce ejecuci\u00f3n de script y no se demostr\u00f3 ninguna.\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"}