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              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
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                "id": "CVE-2025-3909",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
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                "role": "CISA Coordinator",
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                "cweId": "CWE-290",
                "description": "CWE-290 Authentication Bypass by Spoofing",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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    "cna": {
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          "product": "Thunderbird",
          "vendor": "Mozilla",
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      "credits": [
        {
          "lang": "en",
          "value": "Dario Wei\u00dfer"
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              "base64": false,
              "type": "text/html",
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            }
          ],
          "value": "Thunderbird\u0027s handling of the X-Mozilla-External-Attachment-URL header can be exploited to execute JavaScript in the file:/// context. By crafting a nested email attachment (message/rfc822) and setting its content type to application/pdf, Thunderbird may incorrectly render it as HTML when opened, allowing the embedded JavaScript to run without requiring a file download. This behavior relies on Thunderbird auto-saving the attachment to /tmp and linking to it via the file:/// protocol, potentially enabling JavaScript execution as part of the HTML. This vulnerability affects Thunderbird \u003c 128.10.1 and Thunderbird \u003c 138.0.1."
        }
      ],
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          "descriptions": [
            {
              "description": "JavaScript Execution via Spoofed PDF Attachment and file:/// Link",
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              "type": "text"
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    "datePublished": "2025-05-14T16:56:43.630Z",
    "dateReserved": "2025-04-23T17:44:42.650Z",
    "dateUpdated": "2025-05-16T03:55:42.982Z",
    "state": "PUBLISHED"
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