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CVE-2026-114127— Astro: Arbitrary CSS injection in Astro View Transitions

Quick assessment

Affected
withastro astro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Astro 是一个面向内容驱动型网站的 Web 框架。在版本 7.1.0 至 7.3.3 期间，Astro 的服务器端视图过渡（View Transition）CSS 生成器未能将字符串类型的动画属性保留在其生成的声明中。如果应用程序将攻击者控制的数据传入诸如 duration、delay、easing、direction、fillMode 或动画名称等属性，攻击者便可利用 CSS 分隔符终止该声明，并在服务器渲染的页面中注入其选定的 CSS 规则。由于生成的样式表仍会对字面意义上的小于号（<）进行转义，因此注入的

CVSS 2.3 · Low

Affected Version Matrix 1

VendorProduct Version RangeStatus
withastro astro >= 7.1.0, < 7.3.3 affected
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I. Basic Information for CVE-2026-114127

Vulnerability Information
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Vulnerability Title
Astro: Arbitrary CSS injection in Astro View Transitions
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
withastro astro >= 7.1.0, < 7.3.3 -

II. Public POCs for CVE-2026-114127

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III. Intelligence Information for CVE-2026-114127

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Other References for CVE-2026-114127 (4)

IV. Related Vulnerabilities

Same product: astro
Same vendor: withastro
Same weakness: CWE-79

V. Comments for CVE-2026-114127

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