{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-59728",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-07-06T15:34:16.917Z",
        "datePublished": "2026-07-27T19:54:23.009Z",
        "dateUpdated": "2026-07-28T14:27:56.334Z"
    },
    "containers": {
        "cna": {
            "title": "@astrojs/rss: XML Injection via Unescaped RSS Feed Fields",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-91",
                            "lang": "en",
                            "description": "CWE-91: XML Injection (aka Blind XPath Injection)",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 4.3,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "LOW",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "REQUIRED",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/withastro/astro/security/advisories/GHSA-8j5q-mfj2-5q9q",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/withastro/astro/security/advisories/GHSA-8j5q-mfj2-5q9q"
                },
                {
                    "name": "https://github.com/withastro/astro/pull/17209",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/withastro/astro/pull/17209"
                },
                {
                    "name": "https://github.com/withastro/astro/commit/fbcfa039dfe3d700b239f595a6c55ee35e45bd06",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/withastro/astro/commit/fbcfa039dfe3d700b239f595a6c55ee35e45bd06"
                },
                {
                    "name": "https://github.com/withastro/astro/releases/tag/@astrojs/rss@4.0.19",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/withastro/astro/releases/tag/@astrojs/rss@4.0.19"
                }
            ],
            "affected": [
                {
                    "vendor": "withastro",
                    "product": "astro",
                    "versions": [
                        {
                            "version": ">= 1.0.0, < 4.0.19",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-07-27T19:54:23.009Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Astro is a web framework for content-driven websites. In versions 1.0.0 through 4.0.18, the source.title and enclosure.type item fields in packages/astro-rss/src/index.ts are interpolated directly into XML template strings without XML-character escaping before being parsed by fast-xml-parser. Both fields are validated only as z.string(), placing no restriction on XML special characters. An attacker who controls these values can inject arbitrary XML into the generated RSS feed: a value containing \" can break out of an attribute (as with enclosure.type), and a value containing </source> can close an element early and inject additional nodes (as with source.title). This corrupts feed structure, injects false metadata (for example, a fake <link> pointing to a malicious URL), and can cause feed readers to misparse or display attacker-controlled content. In SSR mode (output: 'server'), the poisoned feed is served on every request to all subscribers. This issue has been fixed in version 4.0.19."
                }
            ],
            "source": {
                "advisory": "GHSA-8j5q-mfj2-5q9q",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/withastro/astro/security/advisories/GHSA-8j5q-mfj2-5q9q",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-07-28T14:27:36.621244Z",
                                "id": "CVE-2026-59728",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "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": "2026-07-28T14:27:56.334Z"
                }
            }
        ]
    }
}