{"cve":"CVE-2026-45028","nvd":{"published":"2026-05-13T16:17:00.173","modified":"2026-10-26T17:10:03.270","status":"Analyzed","description":"Astro is a web framework. Astro versions prior to 6.1.10 used AES-GCM encryption to protect the confidentiality and integrity of server island props and slots parameters, but did not bind the ciphertext to its intended component or parameter type. An attacker could replay one component's encrypted props (p) value as another component's slots (s) value, or vice versa. Since slots contain raw unescaped HTML while props may contain user-controlled values, this could lead to XSS in applications. This occurs when the application uses server islands, two different server island components share the same key name for a prop and a slot, and an attacker has full control over the value of the overlapping prop (requires a dynamically rendered page). This vulnerability is fixed in 6.1.10.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","score":2.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79","CWE-323"],"references":["https://github.com/withastro/astro/commit/3d82220a1549e699e34ed433f3846a919f4c02bd","https://github.com/withastro/astro/pull/16457","https://github.com/withastro/astro/security/advisories/GHSA-xr5h-phrj-8vxv"],"products":["astro:astro"],"source":"nvd","synced_at":"2026-10-26T17:39:09.812804557+00:00"},"epss":{"cve":"CVE-2026-45028","score":0.00144,"percentile":0.03633,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-xr5h-phrj-8vxv","url":"https://osv.dev/vulnerability/GHSA-xr5h-phrj-8vxv","summary":"Astro: Server island encrypted parameters vulnerable to cross-component replay","modified":"2026-05-14T20:52:35.407280Z","packages":[{"ecosystem":"npm","name":"astro","purl":"pkg:npm/astro","ranges":["<6.1.10"],"fixed":["6.1.10"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}