{"id":"EUVD-2026-107409","revision":null,"records":[{"revision":"964a11012d8f446dad0ef011d8b8b875","observedAt":"2026-10-30T22:45:26.427+00:00","statement":{"source":"cve-program","id":"CVE-2026-114127","aliases":[],"title":"Astro: Arbitrary CSS injection in Astro View Transitions","description":"Astro is a web framework for content-driven websites. From 7.1.0 until 7.3.3, Astro's server-side View Transition CSS generator does not keep string animation properties within their generated declarations. An application that passes attacker-controlled data into properties such as duration, delay, easing, direction, fillMode, or animation names can allow CSS delimiters to terminate the declaration and add attacker-selected rules to the server-rendered page. The generated stylesheet still escapes literal less-than characters, so the injected content cannot terminate the style element or directly inject HTML or JavaScript. The injected CSS can conceal or reposition content, add generated text, and otherwise misrepresent the interface; some applications may also expose data already present in selectable DOM attributes through conditional resource loads. This issue is fixed in 7.3.3.","state":0,"publishedAt":"2026-10-21T17:30:03.86+00:00","modifiedAt":"2026-10-30T20:16:50.619+00:00","affected":[{"ecosystem":"Vendor product","name":"astro","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"withastro\",\n                    \"product\": \"astro\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 7.1.0, < 7.3.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":2.3,"severity":"LOW"}],"references":["https://github.com/withastro/astro/security/advisories/GHSA-mpr7-6m5w-76rw","https://github.com/withastro/astro/pull/17970","https://github.com/withastro/astro/commit/0b4dc3a211910b589d3805ab4dfedf11b0e712bb","https://github.com/withastro/astro/releases/tag/astro@7.3.3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-114127","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-114127","identifiers":["CVE-2026-114127"]},"retained":false,"historicalAffected":[]},{"revision":"2ae4504c484540eeb357bc10024726c5","observedAt":"2026-11-07T04:35:45.629+00:00","statement":{"source":"euvd","id":"EUVD-2026-107409","aliases":["CVE-2026-114127","GHSA-mpr7-6m5w-76rw"],"title":"Astro is a web framework for content-driven websites. From 7.1.0 until 7.3.3, Astro's server-side View Transition CSS generator does not keep string animation properties within their generated declarations. An application that passes attack…","description":"Astro is a web framework for content-driven websites. From 7.1.0 until 7.3.3, Astro's server-side View Transition CSS generator does not keep string animation properties within their generated declarations. An application that passes attacker-controlled data into properties such as duration, delay, easing, direction, fillMode, or animation names can allow CSS delimiters to terminate the declaration and add attacker-selected rules to the server-rendered page. The generated stylesheet still escapes literal less-than characters, so the injected content cannot terminate the style element or directly inject HTML or JavaScript. The injected CSS can conceal or reposition content, add generated text, and otherwise misrepresent the interface; some applications may also expose data already present in selectable DOM attributes through conditional resource loads. This issue is fixed in 7.3.3.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":2.3,"severity":null}],"references":["https://github.com/withastro/astro/security/advisories/GHSA-mpr7-6m5w-76rw","https://github.com/withastro/astro/pull/17970","https://github.com/withastro/astro/commit/0b4dc3a211910b589d3805ab4dfedf11b0e712bb","https://github.com/withastro/astro/releases/tag/astro@7.3.3"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-107409","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 21, 2026, 5:30:03 PM","dateUpdated":"Oct 30, 2026, 8:16:50 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-107409","identifiers":["EUVD-2026-107409","CVE-2026-114127","GHSA-mpr7-6m5w-76rw"]},"retained":false,"historicalAffected":[]},{"revision":"5254198e54ca422498441de035ac4290","observedAt":"2026-10-31T06:57:45.75+00:00","statement":{"source":"nvd","id":"CVE-2026-114127","aliases":[],"title":"Astro is a web framework for content-driven websites. From 7.1.0 until 7.3.3, Astro's server-side View Transition CSS generator does not keep string animation properties within their generated declarations. An application that passes attack…","description":"Astro is a web framework for content-driven websites. From 7.1.0 until 7.3.3, Astro's server-side View Transition CSS generator does not keep string animation properties within their generated declarations. An application that passes attacker-controlled data into properties such as duration, delay, easing, direction, fillMode, or animation names can allow CSS delimiters to terminate the declaration and add attacker-selected rules to the server-rendered page. The generated stylesheet still escapes literal less-than characters, so the injected content cannot terminate the style element or directly inject HTML or JavaScript. The injected CSS can conceal or reposition content, add generated text, and otherwise misrepresent the interface; some applications may also expose data already present in selectable DOM attributes through conditional resource loads. This issue is fixed in 7.3.3.","state":0,"publishedAt":"2026-10-21T18:17:25.317+00:00","modifiedAt":"2026-10-30T21:16:50.757+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/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","score":2.3,"severity":"LOW"}],"references":["https://github.com/withastro/astro/commit/0b4dc3a211910b589d3805ab4dfedf11b0e712bb","https://github.com/withastro/astro/pull/17970","https://github.com/withastro/astro/releases/tag/astro@7.3.3","https://github.com/withastro/astro/security/advisories/GHSA-mpr7-6m5w-76rw"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-114127","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-79"],"productCriteria":[],"sourceDates":{"published":"2026-10-21T18:17:25.317","lastModified":"2026-10-30T21:16:50.757"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-114127","identifiers":["CVE-2026-114127"]},"retained":false,"historicalAffected":[]},{"revision":"bba4942fbc2b4d33a90ecb757155d0bd","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-mpr7-6m5w-76rw","aliases":["CVE-2026-114127"],"title":"Astro: Arbitrary CSS injection in Astro View Transitions","description":"### Summary\n\nAstro's server-side View Transition CSS generator did not keep string animation properties within their generated CSS declarations. In an application that passes attacker-controlled data into an animation property such as `duration`, a value containing CSS delimiters could terminate the declaration and rule, then add attacker-selected CSS to the server-rendered page.\n\nThe injected content remains inside the generated `<style>` element. It cannot terminate that element or inject HTML or JavaScript because Astro escapes `<` before emitting the stylesheet.\n\n### Severity\n\nExploitation requires an application to pass untrusted, request-derived, or user-controlled content directly into a transition animation value. This is an uncommon application pattern, and applications using static or otherwise trusted transition values are unaffected.\n\nThe resulting capability is limited to CSS in the rendered document. The proof of concept does not demonstrate JavaScript execution, HTML injection, an origin-boundary bypass, or access to server-only data.\n\n### Details\n\nAnimation values are collected by `stringifyAnimations()` in `packages/astro/src/runtime/server/transition.ts` and passed to `addAnimationProperty()`. String values were converted directly with `toString()`:\n\n```ts\nfunction addAnimationProperty(builder: AnimationBuilder, prop: string, value: string | number) {\n  let arr = builder[prop];\n  if (Array.isArray(arr)) {\n    arr.push(value.toString());\n  } else {\n    builder[prop] = [value.toString()];\n  }\n}\n```\n\nThe animation builder then interpolated each value into a declaration:\n\n```ts\nout += `\\n\\t${k}: ${value.join(', ')};`;\n```\n\nThe completed stylesheet passes through `escapeStyleText()`, which escapes literal `<` characters to keep the content inside its HTML `<style>` element. CSS delimiters such as `;`, `{`, and `}` remained active, allowing a value to escape its intended declaration and add another rule.\n\nThe shared serializer handles `duration`, `delay`, `easing`, `direction`, `fillMode`, and animation names, so custom transition objects using those string properties followed the same path.\n\nThe fix encodes CSS declaration delimiters while serializing each animation value. Supported CSS functions and strings, including `calc()` and `var()`, remain unchanged.\n\n### Proof of Concept\n\nUsing `astro@7.3.2`, create an on-demand rendered page:\n\n```astro\n---\nimport { fade } from \"astro:transitions\";\nconst duration = Astro.url.searchParams.get(\"duration\") ?? \"1ms\";\n---\n<div id=\"target\" transition:animate={fade({ duration })}>SAFE</div>\n```\n\nRequest the page with:\n\n```text\n/?duration=1ms%3B%7D%23target%7Bcolor%3Argb(1%2C2%2C3)%3Bfont-size%3A37px%7Dx%7Banimation-duration%3A1ms\n```\n\nBefore the fix, the generated stylesheet contains an active rule equivalent to:\n\n```css\n#target {\n  color: rgb(1, 2, 3);\n  font-size: 37px;\n}\n```\n\nIn Chromium, the target's computed styles change to `rgb(1, 2, 3)` and `37px`. This behavior is reproducible in a production standalone SSR build, not only in the development server.\n\n### Impact\n\nAn attacker can inject CSS into the affected application's rendered page when the application places attacker-controlled data into a transition animation value. The CSS can restyle or conceal content, reposition existing controls, add generated text, or otherwise misrepresent the page's UI.\n\nCSS selectors and conditional resource loads may expose data already present in selectable DOM attributes in some applications, depending on the page and its Content Security Policy. The issue does not expose cookies, server-only values, arbitrary DOM text, or cross-origin response data by itself.\n\n### Affected Versions\n\n`astro >= 7.1.0, <= 7.3.2`.\n\nVersions through 7.0.9 are covered by GHSA-4g3v-8h47-v7g6 / CVE-2026-73422, which had the stronger impact of escaping the `<style>` element and injecting HTML or JavaScript.\n\n### Patched Versions\n\nThis issue is patched in `astro@7.3.3`. Fix: https://github.com/withastro/astro/pull/17970\n\n### Workarounds\n\nDo not pass untrusted or request-derived values into View Transition animation properties. If dynamic values are required, validate them according to the expected CSS grammar before constructing the transition. For `duration` and `delay`, prefer finite numbers or strictly validated CSS time values.\n\n### Credits\n\nReported by @avrlab233.","state":0,"publishedAt":"2026-10-22T16:29:28+00:00","modifiedAt":"2026-10-22T16:45:03.7236349+00:00","affected":[{"ecosystem":"npm","name":"astro","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"7.1.0"},{"kind":"fixed","version":"7.3.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/withastro/astro/security/advisories/GHSA-mpr7-6m5w-76rw","https://nvd.nist.gov/vuln/detail/CVE-2026-114127","https://github.com/withastro/astro/pull/17970","https://github.com/withastro/astro/commit/0b4dc3a211910b589d3805ab4dfedf11b0e712bb","https://github.com/withastro/astro","https://github.com/withastro/astro/releases/tag/astro@7.3.3"],"sourceUrl":"https://github.com/advisories/GHSA-mpr7-6m5w-76rw","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-mpr7-6m5w-76rw","identifiers":["GHSA-mpr7-6m5w-76rw","CVE-2026-114127"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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