CVE-2026-45066 (GCVE-0-2026-45066)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:53 – Updated: 2026-07-14 17:53
VLAI
Title
Symfony: HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification
Summary
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts() or allowMediaHosts() because UrlSanitizer::parse() follows RFC 3986 while browsers follow WHATWG URL parsing, and because <area href> is checked against the media policy rather than the link policy. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
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
CWE
  • CWE-184 - Incomplete List of Disallowed Inputs
  • CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
Vendor Product Version
symfony symfony Affected: >= 6.1.0-BETA1, < 6.4.40
Affected: >= 7.0.0-BETA1, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.12
Create a notification for this product.
symfony html-sanitizer Affected: >= 6.1.0-BETA1, < 6.4.40
Affected: >= 7.0.0-BETA1, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.12
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "symfony",
          "vendor": "symfony",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 6.1.0-BETA1, \u003c 6.4.40"
            },
            {
              "status": "affected",
              "version": "\u003e= 7.0.0-BETA1, \u003c 7.4.12"
            },
            {
              "status": "affected",
              "version": "\u003e= 8.0.0-BETA1, \u003c 8.0.12"
            }
          ]
        },
        {
          "product": "html-sanitizer",
          "vendor": "symfony",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 6.1.0-BETA1, \u003c 6.4.40"
            },
            {
              "status": "affected",
              "version": "\u003e= 7.0.0-BETA1, \u003c 7.4.12"
            },
            {
              "status": "affected",
              "version": "\u003e= 8.0.0-BETA1, \u003c 8.0.12"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts() or allowMediaHosts() because UrlSanitizer::parse() follows RFC 3986 while browsers follow WHATWG URL parsing, and because \u003carea href\u003e is checked against the media policy rather than the link policy. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2.3,
            "baseSeverity": "LOW",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-184",
              "description": "CWE-184: Incomplete List of Disallowed Inputs",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-436",
              "description": "CWE-436: Interpretation Conflict",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-14T17:53:49.836Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/symfony/symfony/security/advisories/GHSA-qc95-4862-92fh",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/symfony/symfony/security/advisories/GHSA-qc95-4862-92fh"
        },
        {
          "name": "https://github.com/symfony/symfony/commit/d506b556d3d3906f3e8660ad82257ce87edbaac4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/symfony/symfony/commit/d506b556d3d3906f3e8660ad82257ce87edbaac4"
        },
        {
          "name": "https://github.com/symfony/symfony/releases/tag/v6.4.40",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/symfony/symfony/releases/tag/v6.4.40"
        },
        {
          "name": "https://github.com/symfony/symfony/releases/tag/v7.4.12",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/symfony/symfony/releases/tag/v7.4.12"
        },
        {
          "name": "https://github.com/symfony/symfony/releases/tag/v8.0.12",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/symfony/symfony/releases/tag/v8.0.12"
        }
      ],
      "source": {
        "advisory": "GHSA-qc95-4862-92fh",
        "discovery": "UNKNOWN"
      },
      "title": "Symfony: HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and \u003carea\u003e Misclassification"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45066",
    "datePublished": "2026-07-14T17:53:49.836Z",
    "dateReserved": "2026-05-08T18:45:10.096Z",
    "dateUpdated": "2026-07-14T17:53:49.836Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-45066",
      "date": "2026-06-14",
      "epss": "0.00048",
      "percentile": "0.15556"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-45066\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-07-14T18:17:16.703\",\"lastModified\":\"2026-07-14T20:25:54.190\",\"vulnStatus\":\"Undergoing Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts() or allowMediaHosts() because UrlSanitizer::parse() follows RFC 3986 while browsers follow WHATWG URL parsing, and because \u003carea href\u003e is checked against the media policy rather than the link policy. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"symfony\",\"product\":\"symfony\",\"versions\":[{\"version\":\"\u003e= 6.1.0-BETA1, \u003c 6.4.40\",\"status\":\"affected\"},{\"version\":\"\u003e= 7.0.0-BETA1, \u003c 7.4.12\",\"status\":\"affected\"},{\"version\":\"\u003e= 8.0.0-BETA1, \u003c 8.0.12\",\"status\":\"affected\"}]},{\"vendor\":\"symfony\",\"product\":\"html-sanitizer\",\"versions\":[{\"version\":\"\u003e= 6.1.0-BETA1, \u003c 6.4.40\",\"status\":\"affected\"},{\"version\":\"\u003e= 7.0.0-BETA1, \u003c 7.4.12\",\"status\":\"affected\"},{\"version\":\"\u003e= 8.0.0-BETA1, \u003c 8.0.12\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"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\",\"baseScore\":2.3,\"baseSeverity\":\"LOW\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"PASSIVE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"LOW\",\"subIntegrityImpact\":\"LOW\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-184\"},{\"lang\":\"en\",\"value\":\"CWE-436\"}]}],\"references\":[{\"url\":\"https://github.com/symfony/symfony/commit/d506b556d3d3906f3e8660ad82257ce87edbaac4\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/symfony/symfony/releases/tag/v6.4.40\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/symfony/symfony/releases/tag/v7.4.12\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/symfony/symfony/releases/tag/v8.0.12\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/symfony/symfony/security/advisories/GHSA-qc95-4862-92fh\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.