{"id":"CVE-2026-45028","aliases":["CLSA-2026-1789031241","CLSA-2026-1792161562","CLSA-2026-1792161707","CLSA-2026-1792161794","CLSA-2026-1792161859","CLSA-2026-1792454046","EUVD-2026-30054","GHSA-xr5h-phrj-8vxv"],"status":"published","title":"Astro: Server island encrypted parameters vulnerable to cross-component replay","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.","severity":{"version":"4.0","score":2.9,"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","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00144,"percentile":0.03731,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-323","CWE-79"],"published":"2026-05-13T01:36:39Z","modified":"2026-10-30T19:46:03Z","fixes":[{"ecosystem":"npm","package":"astro","fixed_in":["6.1.10"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:npm","package":"astro","fixed_in":["5.18.1-tuxcare.6"],"sources":["osv"]},{"ecosystem":"TuxCare:npm","package":"@astrojs/internal-helpers","fixed_in":["5.18.1-tuxcare.6"],"sources":["osv"]},{"ecosystem":"TuxCare:npm","package":"@astrojs/prism","fixed_in":["5.18.1-tuxcare.6"],"sources":["osv"]},{"ecosystem":"TuxCare:npm","package":"@astrojs/underscore-redirects","fixed_in":["5.18.1-tuxcare.6"],"sources":["osv"]},{"ecosystem":"TuxCare:npm","package":"@astrojs/upgrade","fixed_in":["5.18.1-tuxcare.6"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"astro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.10"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"astro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.18.1-tuxcare.0"},{"fixed":"5.18.1-tuxcare.6"}]}],"versions":["5.18.1","5.18.1-tuxcare.1","5.18.1-tuxcare.2","5.18.1-tuxcare.3","5.18.1-tuxcare.4","5.18.1-tuxcare.5"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"@astrojs/internal-helpers","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.18.1-tuxcare.0"},{"fixed":"5.18.1-tuxcare.6"}]}],"versions":["5.18.1","5.18.1-tuxcare.2","5.18.1-tuxcare.3","5.18.1-tuxcare.4","5.18.1-tuxcare.5"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"@astrojs/prism","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.18.1-tuxcare.0"},{"fixed":"5.18.1-tuxcare.6"}]}],"versions":["5.18.1","5.18.1-tuxcare.2","5.18.1-tuxcare.3","5.18.1-tuxcare.4","5.18.1-tuxcare.5"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"@astrojs/underscore-redirects","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.18.1-tuxcare.0"},{"fixed":"5.18.1-tuxcare.6"}]}],"versions":["5.18.1","5.18.1-tuxcare.2","5.18.1-tuxcare.3","5.18.1-tuxcare.4","5.18.1-tuxcare.5"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"@astrojs/upgrade","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.18.1-tuxcare.0"},{"fixed":"5.18.1-tuxcare.6"}]}],"versions":["5.18.1","5.18.1-tuxcare.2","5.18.1-tuxcare.3","5.18.1-tuxcare.4","5.18.1-tuxcare.5"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"astro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.18.2-tuxcare.0"},{"fixed":"5.18.2-tuxcare.1"}]}],"versions":["5.18.2"],"bundled":9},{"source":"osv","ecosystem":"npm","package":"astro","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"6.1.10"}]}]}],"products":[{"vendor":"astro","product":"astro"},{"vendor":"withastro","product":"astro"}],"references":[{"url":"https://github.com/withastro/astro/security/advisories/GHSA-xr5h-phrj-8vxv","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://github.com/withastro/astro/pull/16457","tags":["x_refsource_MISC","Issue Tracking","Patch","fix","web"]},{"url":"https://github.com/withastro/astro/commit/3d82220a1549e699e34ed433f3846a919f4c02bd","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45028","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xr5h-phrj-8vxv"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45028.json","tags":["advisory"]},{"url":"https://github.com/withastro/astro","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-45028","title":"Astro: Server island encrypted parameters vulnerable to cross-component replay","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.","status":"published","published":"2026-05-13T15:50:49.869Z","modified":"2026-05-14T18:33:24.63Z","cvss":[{"version":"4.0","score":2.9,"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","level":"low","assessor":"cna"}],"cwes":["CWE-323"],"updated_at":"2026-11-02T13:46:43.922571Z"}],"euvd":[{"id":"EUVD-2026-30054","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.","status":"published","published":"2026-05-13T15:50:49Z","modified":"2026-05-14T18:33:24Z","cvss":[{"version":"4.0","score":2.9,"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","level":"low"}],"updated_at":"2026-11-02T19:04:30.595644Z"}],"ghsa":[{"id":"GHSA-xr5h-phrj-8vxv","title":"Astro: Server island encrypted parameters vulnerable to cross-component replay","description":"### Impact\n\nAstro 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.\n\nSince slots contain raw unescaped HTML while props may contain user-controlled values, this could lead to XSS in applications that meet **all** of the following conditions:\n\n- The application uses server islands\n- Two different server island components share the same key name for a prop and a slot\n- An attacker has full control over the value of the overlapping prop (requires a dynamically rendered page)\n\nThese conditions are very unlikely to occur in real-world production applications.\n\n### Patches\n\nThis has been patched in **astro@6.1.10**.\n\nThe fix binds each encrypted parameter to its target component and purpose using AES-GCM authenticated additional data (AAD). Each ciphertext now includes context like `props:IslandName` or `slots:IslandName`, so encrypted data for one component cannot be replayed against a different component, and encrypted props cannot be reused as slots.\n\n### References\n\n- Fix PR: https://github.com/withastro/astro/pull/16457\n- Example demonstrating the vulnerability: https://github.com/CyberSecurityAustria/ACSC2026-web-astronomical","status":"published","published":"2026-05-13T01:36:39Z","modified":"2026-05-14T20:38:54Z","cvss":[{"version":"4.0","score":2.9,"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","level":"low"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79","CWE-323"],"updated_at":"2026-11-02T14:40:09.033429Z"}],"nvd":[{"id":"CVE-2026-45028","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.","status":"published","published":"2026-05-13T16:17:00.173Z","modified":"2026-10-26T17:10:03.27Z","cvss":[{"version":"4.0","score":2.9,"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-323","CWE-79"],"updated_at":"2026-11-02T14:12:19.020465Z"}],"osv":[{"id":"CVE-2026-45028","title":"Astro: Server island encrypted parameters vulnerable to cross-component replay","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.","status":"published","published":"2026-05-13T15:50:49.869Z","modified":"2026-10-28T02:30:30.283221112Z","cvss":[{"version":"4.0","score":2.9,"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","level":"low"}],"cwes":["CWE-323"],"updated_at":"2026-11-02T15:45:05.172514Z"},{"id":"GHSA-xr5h-phrj-8vxv","title":"Astro: Server island encrypted parameters vulnerable to cross-component replay","description":"### Impact\n\nAstro 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.\n\nSince slots contain raw unescaped HTML while props may contain user-controlled values, this could lead to XSS in applications that meet **all** of the following conditions:\n\n- The application uses server islands\n- Two different server island components share the same key name for a prop and a slot\n- An attacker has full control over the value of the overlapping prop (requires a dynamically rendered page)\n\nThese conditions are very unlikely to occur in real-world production applications.\n\n### Patches\n\nThis has been patched in **astro@6.1.10**.\n\nThe fix binds each encrypted parameter to its target component and purpose using AES-GCM authenticated additional data (AAD). Each ciphertext now includes context like `props:IslandName` or `slots:IslandName`, so encrypted data for one component cannot be replayed against a different component, and encrypted props cannot be reused as slots.\n\n### References\n\n- Fix PR: https://github.com/withastro/astro/pull/16457\n- Example demonstrating the vulnerability: https://github.com/CyberSecurityAustria/ACSC2026-web-astronomical","status":"published","published":"2026-05-13T01:36:39Z","modified":"2026-05-14T20:52:35.40728Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"},{"version":"4.0","score":2.9,"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","level":"low"}],"cwes":["CWE-323","CWE-79"],"updated_at":"2026-11-02T15:47:00.198893Z"},{"id":"CLSA-2026-1789031241","title":"TuxCare security update for astro (1 CVE)","description":"TuxCare rebuilt astro to address 1 CVE. Fixed in 5.18.1-tuxcare.6.","status":"published","published":"2026-09-10T09:07:21Z","modified":"2026-10-30T19:46:03.52762808Z","updated_at":"2026-11-02T15:43:47.938828Z"},{"id":"CLSA-2026-1792161562","title":"TuxCare security update for @astrojs/internal-helpers (1 CVE)","description":"TuxCare rebuilt @astrojs/internal-helpers to address 1 CVE. Fixed in 5.18.1-tuxcare.6.","status":"published","published":"2026-10-16T14:39:22Z","modified":"2026-10-16T16:31:04.564589774Z","updated_at":"2026-11-02T15:43:51.213191Z"},{"id":"CLSA-2026-1792161707","title":"TuxCare security update for @astrojs/prism (1 CVE)","description":"TuxCare rebuilt @astrojs/prism to address 1 CVE. Fixed in 5.18.1-tuxcare.6.","status":"published","published":"2026-10-16T14:41:47Z","modified":"2026-10-16T16:31:27.7949403Z","updated_at":"2026-11-02T15:43:51.213191Z"},{"id":"CLSA-2026-1792161794","title":"TuxCare security update for @astrojs/underscore-redirects (1 CVE)","description":"TuxCare rebuilt @astrojs/underscore-redirects to address 1 CVE. Fixed in 5.18.1-tuxcare.6.","status":"published","published":"2026-10-16T14:43:14Z","modified":"2026-10-16T16:30:32.836950716Z","updated_at":"2026-11-02T15:43:51.213191Z"},{"id":"CLSA-2026-1792161859","title":"TuxCare security update for @astrojs/upgrade (1 CVE)","description":"TuxCare rebuilt @astrojs/upgrade to address 1 CVE. Fixed in 5.18.1-tuxcare.6.","status":"published","published":"2026-10-16T14:44:19Z","modified":"2026-10-16T16:31:17.391896712Z","updated_at":"2026-11-02T15:43:51.213191Z"},{"id":"CLSA-2026-1792454046","title":"TuxCare security update for astro (9 CVEs)","description":"TuxCare rebuilt astro to address 9 CVEs. Fixed in 5.18.2-tuxcare.1.","status":"published","published":"2026-10-19T23:54:06Z","modified":"2026-10-20T01:45:16.00100881Z","updated_at":"2026-11-02T15:43:54.378946Z"}]}}