CVE-2026-73422
published 2026-08-12CVE-2026-73422: Astro is a web framework for content-driven websites. From 2.9.0 until 7.1.0, Astro's server-side View Transition CSS generator interpolates animation…
PriorityP430medium5.3CVSS 4.0
AVNACLATNPRNUIPVCNVINVANSCLSILSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.39%
33.5th percentile
Astro is a web framework for content-driven websites. From 2.9.0 until 7.1.0, Astro's server-side View Transition CSS generator interpolates animation properties into an inline style element without escaping them for CSS and HTML contexts. An attacker-controlled View Transition animation value such as duration can terminate the generated style element and inject arbitrary HTML or JavaScript. The affected code is packages/astro/src/runtime/server/transition.ts; renderTransition passes sheet.toString() into markHTMLString(), while addAnimationProperty serializes duration through toTimeValue() and also handles easing, direction, delay, fillMode, and name. Exploitation requires an on-demand or server-rendered route to pass attacker-controlled data into a View Transition animation definition and can execute arbitrary JavaScript in the affected application's origin, allowing access to sensitive page data and authenticated actions available to the victim. This issue is fixed in version 7.1.0.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| rhoai | odh-feature-server-rhel9 | — | — |
| withastro | astro | — | — |
CVSS provenance
nvdv4.05.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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
vendor_redhat5.3MEDIUM
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Red Hat
astro: Astro: Arbitrary code execution via unescaped View Transition animation properties
vendor_redhat·2026-08-12·CVSS 5.3
CVE-2026-73422 [MEDIUM] CWE-79 astro: Astro: Arbitrary code execution via unescaped View Transition animation properties
astro: Astro: Arbitrary code execution via unescaped View Transition animation properties
Astro is a web framework for content-driven websites. From 2.9.0 until 7.1.0, Astro's server-side View Transition CSS generator interpolates animation properties into an inline style element without escaping them for CSS and HTML contexts. An attacker-controlled View Transition animation value such as duration can terminate the generated style element and inject arbitrary HTML or JavaScript. The affected code is packages/astro/src/runtime/server/transition.ts; renderTransition passes sheet.toString() into markHTMLString(), while addAnimationProperty serializes duration through toTimeValue() and also handles easing, direction, delay, fillMode, and name. Exploitation requires an on-demand or server-ren
VulDB
withastro Astro up to 7.0.x View Transition CSS Generator transition.ts renderTransition cross site scripting
vuldb·2026-08-12·CVSS 5.3
CVE-2026-73422 [MEDIUM] withastro Astro up to 7.0.x View Transition CSS Generator transition.ts renderTransition cross site scripting
A vulnerability labeled as problematic has been found in withastro Astro up to 7.0.x. This impacts the function renderTransition of the file packages/astro/src/runtime/server/transition.ts of the component View Transition CSS Generator. Executing a manipulation can lead to cross site scripting.
This vulnerability is handled as CVE-2026-73422. The attack can be executed remotely. There is not any exploit available.
The affected component should be upgraded.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-73422 python-jupytext: Astro: Arbitrary code execution via unescaped View Transition animation properties [fedora-all]
bugzilla·2026-08-25·CVSS 5.3
CVE-2026-73422 [MEDIUM] CVE-2026-73422 python-jupytext: Astro: Arbitrary code execution via unescaped View Transition animation properties [fedora-all]
CVE-2026-73422 python-jupytext: Astro: Arbitrary code execution via unescaped View Transition animation properties [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Astro is a web framework for content-driven websites. From 2.9.0 until 7.1.0, Astro's server-side View Transition CSS generator interpolates animation properties into an inline style element without escaping them for CSS and HTML contexts. An attacker-controlled View Transition animation value such as duration can terminate the generated style element and inject arbitrary HTML or JavaScript. The affected code is packages/astro/src/runtime/ser
Bugzilla
CVE-2026-73422 astro: Astro: Arbitrary code execution via unescaped View Transition animation properties
bugzilla·2026-08-12·CVSS 5.3
CVE-2026-73422 [MEDIUM] CVE-2026-73422 astro: Astro: Arbitrary code execution via unescaped View Transition animation properties
CVE-2026-73422 astro: Astro: Arbitrary code execution via unescaped View Transition animation properties
Astro is a web framework for content-driven websites. From 2.9.0 until 7.1.0, Astro's server-side View Transition CSS generator interpolates animation properties into an inline style element without escaping them for CSS and HTML contexts. An attacker-controlled View Transition animation value such as duration can terminate the generated style element and inject arbitrary HTML or JavaScript. The affected code is packages/astro/src/runtime/server/transition.ts; renderTransition passes sheet.toString() into markHTMLString(), while addAnimationProperty serializes duration through toTimeValue() and also handles easing, direction, delay, fillMode, and name. Exploitation requires an on-deman
https://github.com/withastro/astro/commit/092da560eea77ee63a3e2c583c80d8238544e42bhttps://github.com/withastro/astro/pull/17393https://github.com/withastro/astro/releases/tag/[email protected]https://github.com/withastro/astro/security/advisories/GHSA-4g3v-8h47-v7g6https://github.com/withastro/astro/security/advisories/GHSA-4g3v-8h47-v7g6
2026-08-12
Published