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vuln-cve/data/2026/100xxx/CVE-2026-100803.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-100803",
"assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
"state": "PUBLISHED",
"assignerShortName": "mozilla",
"dateReserved": "2026-09-26T19:17:51.124Z",
"datePublished": "2026-09-29T12:36:20.195Z",
"dateUpdated": "2026-10-01T15:16:27.751Z"
},
"containers": {
"cna": {
"affected": [
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"status": "unaffected",
"version": "115.42",
"lessThanOrEqual": "115.*",
"versionType": "rpm"
},
{
"status": "unaffected",
"version": "140.17",
"lessThanOrEqual": "140.*",
"versionType": "rpm"
},
{
"status": "unaffected",
"version": "153.4",
"lessThanOrEqual": "153.*",
"versionType": "rpm"
},
{
"status": "unaffected",
"version": "157",
"lessThanOrEqual": "*",
"versionType": "rpm"
}
]
},
{
"product": "Thunderbird",
"vendor": "Mozilla",
"versions": [
{
"status": "unaffected",
"version": "140.17",
"lessThanOrEqual": "140.*",
"versionType": "rpm"
},
{
"status": "unaffected",
"version": "153.4",
"lessThanOrEqual": "153.*",
"versionType": "rpm"
},
{
"status": "unaffected",
"version": "157",
"lessThanOrEqual": "*",
"versionType": "rpm"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Same-origin policy bypass in the WebExtensions component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.",
"supportingMedia": [
{
"type": "text/html",
"base64": false,
"value": "Same-origin policy bypass in the WebExtensions component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
}
]
}
],
"title": "Same-origin policy bypass in the WebExtensions component",
"references": [
{
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2057988"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
}
],
"credits": [
{
"lang": "en",
"value": "Yaqoub Aldurayhim"
}
],
"providerMetadata": {
"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
"shortName": "mozilla",
"dateUpdated": "2026-09-30T17:20:42.279Z"
}
},
"adp": [
{
"problemTypes": [
{
"descriptions": [
{
"type": "CWE",
"cweId": "CWE-346",
"lang": "en",
"description": "CWE-346 Origin Validation Error"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 8.1,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
"integrityImpact": "HIGH",
"userInteraction": "REQUIRED",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
}
},
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-10-01T15:15:51.082535Z",
"id": "CVE-2026-100803",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-01T15:16:27.751Z"
}
}
]
}
}