{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-68747",
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "state": "PUBLISHED",
        "assignerShortName": "EEF",
        "dateReserved": "2026-07-31T13:23:00.355Z",
        "datePublished": "2026-08-06T14:50:03.143Z",
        "dateUpdated": "2026-08-19T11:50:10.843Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://repo.hex.pm",
                    "cpes": [
                        "cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.HtmlSanitizeEx.Scrubber.CSS'",
                        "'Elixir.HtmlSanitizeEx'"
                    ],
                    "packageName": "html_sanitize_ex",
                    "packageURL": "pkg:hex/html_sanitize_ex",
                    "product": "html_sanitize_ex",
                    "programFiles": [
                        "lib/html_sanitize_ex/scrubber/css.ex",
                        "lib/html_sanitize_ex.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.HtmlSanitizeEx.Scrubber.CSS':scrub/1"
                        },
                        {
                            "name": "'Elixir.HtmlSanitizeEx':html5/1"
                        }
                    ],
                    "repo": "https://github.com/rrrene/html_sanitize_ex",
                    "vendor": "rrrene",
                    "versions": [
                        {
                            "lessThan": "1.4.5",
                            "status": "affected",
                            "version": "0.3.1",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "1.5.4",
                            "status": "affected",
                            "version": "1.5.0-rc.0",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "collectionURL": "https://github.com",
                    "cpes": [
                        "cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.HtmlSanitizeEx.Scrubber.CSS'",
                        "'Elixir.HtmlSanitizeEx'"
                    ],
                    "packageName": "rrrene/html_sanitize_ex",
                    "packageURL": "pkg:github/rrrene/html_sanitize_ex",
                    "product": "html_sanitize_ex",
                    "programFiles": [
                        "lib/html_sanitize_ex/scrubber/css.ex",
                        "lib/html_sanitize_ex.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.HtmlSanitizeEx.Scrubber.CSS':scrub/1"
                        },
                        {
                            "name": "'Elixir.HtmlSanitizeEx':html5/1"
                        }
                    ],
                    "repo": "https://github.com/rrrene/html_sanitize_ex",
                    "vendor": "rrrene",
                    "versions": [
                        {
                            "changes": [
                                {
                                    "at": "0b9f9ad63a7529d4f2c3c1134c371adc3e654308",
                                    "status": "unaffected"
                                },
                                {
                                    "at": "c311a499db0b0baef06493fb3cfeb730c0f18f28",
                                    "status": "unaffected"
                                }
                            ],
                            "lessThan": "*",
                            "status": "affected",
                            "version": "21f90012eb21aa36f4e3701b7547e12faf0f3c8b",
                            "versionType": "git"
                        }
                    ]
                }
            ],
            "configurations": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p>Only <code>HtmlSanitizeEx.html5/1</code>, and custom scrubbers declared with <code>use HtmlSanitizeEx, extend: :html5</code>, permit <code>&lt;style&gt;</code> elements, and the sanitized output must be rendered to other users. Applications calling <code>HtmlSanitizeEx.Scrubber.CSS.scrub/1</code> directly are also affected.</p>"
                        },
                        {
                            "base64": false,
                            "type": "text/markdown",
                            "value": "Only `HtmlSanitizeEx.html5/1`, and custom scrubbers declared with `use HtmlSanitizeEx, extend: :html5`, permit `<style>` elements, and the sanitized output must be rendered to other users. Applications calling `HtmlSanitizeEx.Scrubber.CSS.scrub/1` directly are also affected."
                        }
                    ],
                    "value": "Only HtmlSanitizeEx.html5/1, and custom scrubbers declared with use HtmlSanitizeEx, extend: :html5, permit <style> elements, and the sanitized output must be rendered to other users. Applications calling HtmlSanitizeEx.Scrubber.CSS.scrub/1 directly are also affected."
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "cpeMatch": [
                                {
                                    "criteria": "cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*",
                                    "versionEndExcluding": "1.4.5",
                                    "versionStartIncluding": "0.3.1",
                                    "vulnerable": true
                                },
                                {
                                    "criteria": "cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*",
                                    "versionEndExcluding": "1.5.4",
                                    "versionStartIncluding": "1.5.0-rc.0",
                                    "vulnerable": true
                                }
                            ],
                            "negate": false,
                            "operator": "OR"
                        }
                    ],
                    "operator": "AND"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Peter Ullrich"
                },
                {
                    "lang": "en",
                    "type": "analyst",
                    "value": "Jonatan Männchen / EEF"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "René Föhring"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p>Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to inject CSS at-rules, including an import of a remote stylesheet, into a page served to other users. <code>HtmlSanitizeEx.Scrubber.CSS.scrub/1</code> applies its property and value allowlist through a <code>Regex.replace</code> over substrings matching a <code>property: value</code> declaration pattern, so input that does not match that pattern is never inspected and is copied to the output unchanged. <code>@import url(//attacker.example/style.css);</code> survives, while the same URL inside a <code>background: url(...)</code> declaration is removed.</p>\n<p>Element boundaries are resolved before the scrubber runs, so injected content does not escape the <code>&lt;style&gt;</code> element and no script executes.</p>\n<p>This issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.4.</p>"
                        },
                        {
                            "base64": false,
                            "type": "text/markdown",
                            "value": "Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to inject CSS at-rules, including an import of a remote stylesheet, into a page served to other users. `HtmlSanitizeEx.Scrubber.CSS.scrub/1` applies its property and value allowlist through a `Regex.replace` over substrings matching a `property: value` declaration pattern, so input that does not match that pattern is never inspected and is copied to the output unchanged. `@import url(//attacker.example/style.css);` survives, while the same URL inside a `background: url(...)` declaration is removed.\n\nElement boundaries are resolved before the scrubber runs, so injected content does not escape the `<style>` element and no script executes.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.4."
                        }
                    ],
                    "value": "Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to inject CSS at-rules, including an import of a remote stylesheet, into a page served to other users. HtmlSanitizeEx.Scrubber.CSS.scrub/1 applies its property and value allowlist through a Regex.replace over substrings matching a property: value declaration pattern, so input that does not match that pattern is never inspected and is copied to the output unchanged. @import url(//attacker.example/style.css); survives, while the same URL inside a background: url(...) declaration is removed.\n\nElement boundaries are resolved before the scrubber runs, so injected content does not escape the <style> element and no script executes.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.4."
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-148",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-148 Content Spoofing"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "attackVector": "NETWORK",
                        "baseScore": 2.3,
                        "baseSeverity": "LOW",
                        "privilegesRequired": "NONE",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "LOW",
                        "subIntegrityImpact": "LOW",
                        "userInteraction": "PASSIVE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
                        "version": "4.0",
                        "vulnAvailabilityImpact": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnerabilityResponseEffort": "NOT_DEFINED"
                    },
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-74",
                            "description": "CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
                "shortName": "EEF",
                "dateUpdated": "2026-08-19T11:50:10.843Z"
            },
            "references": [
                {
                    "tags": [
                        "vendor-advisory",
                        "related"
                    ],
                    "url": "https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-87v2-pfhj-r5x7"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://cna.erlef.org/cves/CVE-2026-68747.html"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://osv.dev/vulnerability/EEF-CVE-2026-68747"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/rrrene/html_sanitize_ex/commit/0b9f9ad63a7529d4f2c3c1134c371adc3e654308"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/rrrene/html_sanitize_ex/commit/c311a499db0b0baef06493fb3cfeb730c0f18f28"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "title": "CSS sanitizer allowlist bypass in html_sanitize_ex via non-declaration input",
            "workarounds": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p>Sanitize with <code>basic_html/1</code>, <code>markdown_html/1</code> or <code>strip_tags/1</code>, none of which allow <code>&lt;style&gt;</code> elements, or define a custom scrubber that omits it.</p>\n<p>A Content-Security-Policy <code>style-src</code> directive that permits no external stylesheet origins stops an injected <code>@import</code> from loading, though injected inline rules still apply.</p>"
                        },
                        {
                            "base64": false,
                            "type": "text/markdown",
                            "value": "Sanitize with `basic_html/1`, `markdown_html/1` or `strip_tags/1`, none of which allow `<style>` elements, or define a custom scrubber that omits it.\n\nA Content-Security-Policy `style-src` directive that permits no external stylesheet origins stops an injected `@import` from loading, though injected inline rules still apply."
                        }
                    ],
                    "value": "Sanitize with basic_html/1, markdown_html/1 or strip_tags/1, none of which allow <style> elements, or define a custom scrubber that omits it.\n\nA Content-Security-Policy style-src directive that permits no external stylesheet origins stops an injected @import from loading, though injected inline rules still apply."
                }
            ]
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-06T15:43:31.189847Z",
                                "id": "CVE-2026-68747",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-06T15:43:37.237Z"
                }
            }
        ]
    }
}