github - ghsa-8r38-4g4q-hgvw

GHSA-8R38-4G4Q-HGVW

Vulnerability from github – Published: 2025-06-26 21:31 – Updated: 2025-11-03 21:34

Details

Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an embed tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability affects Firefox < 140 and Firefox ESR < 128.12.

Severity ?

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2025-6429"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-116"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-24T13:15:23Z",
    "severity": "MODERATE"
  },
  "details": "Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag.  This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability affects Firefox \u003c 140 and Firefox ESR \u003c 128.12.",
  "id": "GHSA-8r38-4g4q-hgvw",
  "modified": "2025-11-03T21:34:05Z",
  "published": "2025-06-26T21:31:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-6429"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1970658"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-51"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-53"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-54"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-55"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-6429 (GCVE-0-2025-6429)

Vulnerability from cvelistv5 – Published: 2025-06-24 12:28 – Updated: 2025-11-03 20:07

Summary

Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability affects Firefox < 140, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.

Severity ?

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CWE

CWE-116 - Improper Encoding or Escaping of Output

Assigner

mozilla

References

URL

Tags

	https://bugzilla.mozilla.org/show_bug.cgi?id=1970658
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

Vendor

Product

Version

Mozilla

Firefox

Affected: unspecified , < 140 (custom)

Mozilla	Firefox ESR	Affected: unspecified , < 128.12 (custom)
Mozilla	Thunderbird	Affected: unspecified , < 140 (custom)
Mozilla	Thunderbird	Affected: unspecified , < 128.12 (custom)

Credits

Masato Kinugawa

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-6429",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-06-25T14:21:21.354270Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-116",
                "description": "CWE-116 Improper Encoding or Escaping of Output",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-06-25T14:28:51.535Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T20:07:03.248Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "140",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
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        },
        {
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          "vendor": "Mozilla",
          "versions": [
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              "status": "affected",
              "version": "unspecified",
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        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "140",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "128.12",
              "status": "affected",
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              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Masato Kinugawa"
        }
      ],
      "descriptions": [
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          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an \u003ccode\u003eembed\u003c/code\u003e tag.  This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability affects Firefox \u003c 140, Firefox ESR \u003c 128.12, Thunderbird \u003c 140, and Thunderbird \u003c 128.12."
            }
          ],
          "value": "Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag.  This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability affects Firefox \u003c 140, Firefox ESR \u003c 128.12, Thunderbird \u003c 140, and Thunderbird \u003c 128.12."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-30T16:13:00.645Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1970658"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2025-51/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2025-53/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2025-54/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2025-55/"
        }
      ],
      "title": "Incorrect parsing of URLs could have allowed embedding of youtube.com"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2025-6429",
    "datePublished": "2025-06-24T12:28:00.819Z",
    "dateReserved": "2025-06-20T14:51:34.184Z",
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    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-8R38-4G4Q-HGVW

CVE-2025-6429 (GCVE-0-2025-6429)

Tags

Sightings

Nomenclature