{"id":"CVE-2026-59728","revision":"2363384347c74117947153ec0aff8ca1","records":[{"revision":"2363384347c74117947153ec0aff8ca1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-59728","aliases":[],"title":"@astrojs/rss: XML Injection via Unescaped RSS Feed Fields","description":"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.","state":0,"publishedAt":"2026-07-27T19:54:23.009+00:00","modifiedAt":"2026-07-28T14:27:56.334+00:00","affected":[{"ecosystem":"Vendor product","name":"astro","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"withastro\",\n                    \"product\": \"astro\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.0.0, < 4.0.19\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/withastro/astro/security/advisories/GHSA-8j5q-mfj2-5q9q","https://github.com/withastro/astro/pull/17209","https://github.com/withastro/astro/commit/fbcfa039dfe3d700b239f595a6c55ee35e45bd06","https://github.com/withastro/astro/releases/tag/@astrojs/rss@4.0.19"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-59728","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-59728","identifiers":["CVE-2026-59728"]},"retained":false,"historicalAffected":[]}],"coverage":[]}