{
    "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"
                }
            }
        ]
    }
}