High [CVE-2026-73422] Arbitrary code execution via unescaped View Transition animation properties
This high-severity Red Hat Linux advisory covers CVE-2026-73422 affecting Red Hat OpenShift AI (RHOAI).
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Summary
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.
A flaw was found in Astro. A remote attacker can exploit a reflected Cross-Site Scripting (XSS) vulnerability due to unescaped View Transition animation properties in the server-side CSS generator.
Affected product named by the advisory: Red Hat OpenShift AI (RHOAI).
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Sanitize and validate all user-supplied inputs before assigning them to View Transition animation properties in dynamic routes, or temporarily disable server-side View Transitions for routes processing untrusted request parameters.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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