{"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"}}]}}