CVE-2025-6430 (GCVE-0-2025-6430)
Vulnerability from cvelistv5
Published
2025-06-24 12:28
Modified
2026-04-13 14:30
Severity ?
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
When a file download is specified via the `Content-Disposition` header, that directive would be ignored if the file was included via a `<embed>` or `<object>` tag, potentially making a website vulnerable to a cross-site scripting attack. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
References
Impacted products
Vendor Product Version
Mozilla Firefox Unaffected: 128.12
Unaffected: 140
 Create a notification for this product.
   Mozilla Thunderbird Unaffected: 128.12
Unaffected: 140
 Create a notification for this product.
Show details on NVD website

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            "cvssV3_1": {
              "attackComplexity": "LOW",
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              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "CHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
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                "options": [
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                "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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          "value": "Daniil Satyaev (Positive Technologies)"
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              "value": "When a file download is specified via the \u003ccode\u003eContent-Disposition\u003c/code\u003e header, that directive would be ignored if the file was included via a \u003ccode\u003e\u0026lt;embed\u0026gt;\u003c/code\u003e or \u003ccode\u003e\u0026lt;object\u0026gt;\u003c/code\u003e tag, potentially making a website vulnerable to a cross-site scripting attack. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12."
            }
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-04-13T14:30:45.145Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
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          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1971140"
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        },
        {
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        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2025-54/"
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        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2025-55/"
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    "dateReserved": "2025-06-20T14:51:35.561Z",
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    "state": "PUBLISHED"
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