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{
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"cveMetadata": {
"cveId": "CVE-2025-55303",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2025-08-12T16:15:30.238Z",
"datePublished": "2025-08-19T18:08:00.244Z",
"dateUpdated": "2025-08-19T20:50:34.071Z"
},
"containers": {
"cna": {
"title": "Unauthorized third-party images in Astro’s _image endpoint",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-79",
"lang": "en",
"description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-115",
"lang": "en",
"description": "CWE-115: Misinterpretation of Input",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"subAvailabilityImpact": "NONE",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"version": "4.0"
}
}
],
"references": [
{
"name": "https://github.com/withastro/astro/security/advisories/GHSA-xf8x-j4p2-f749",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/withastro/astro/security/advisories/GHSA-xf8x-j4p2-f749"
},
{
"name": "https://github.com/withastro/astro/commit/4d16de7f95db5d1ec1ce88610d2a95e606e83820",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/withastro/astro/commit/4d16de7f95db5d1ec1ce88610d2a95e606e83820"
}
],
"affected": [
{
"vendor": "withastro",
"product": "astro",
"versions": [
{
"version": ">= 5.0.0-alpha.0, < 5.13.2",
"status": "affected"
},
{
"version": "< 4.16.18",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2025-08-19T18:08:00.244Z"
},
"descriptions": [
{
"lang": "en",
"value": "Astro is a web framework for content-driven websites. In versions of astro before 5.13.2 and 4.16.18, the image optimization endpoint in projects deployed with on-demand rendering allows images from unauthorized third-party domains to be served. On-demand rendered sites built with Astro include an /_image endpoint which returns optimized versions of images. A bug in impacted versions of astro allows an attacker to bypass the third-party domain restrictions by using a protocol-relative URL as the image source, e.g. /_image?href=//example.com/image.png. This vulnerability is fixed in 5.13.2 and 4.16.18."
}
],
"source": {
"advisory": "GHSA-xf8x-j4p2-f749",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"references": [
{
"url": "https://github.com/withastro/astro/security/advisories/GHSA-xf8x-j4p2-f749",
"tags": [
"exploit"
]
}
],
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2025-08-19T20:49:42.803973Z",
"id": "CVE-2025-55303",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2025-08-19T20:50:34.071Z"
}
}
]
}
}