CyberRota Analysis
AI-GeneratedAstro's server-side View Transition CSS generator, present in versions 2.9.0 to 7.1.0, is vulnerable to arbitrary HTML or JavaScript injection due to improper escaping of animation properties. Attackers can exploit this vulnerability by injecting malicious data into View Transition animations, potentially executing arbitrary JavaScript within the application's origin and compromising sensitive user data. Developers using affected versions should prioritize upgrading to version 7.1.0 to mitigate this risk.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
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.