https://db.gcve.eu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Mon, 05 Oct 2026 13:54:50 +0000 https://db.gcve.eu/vuln/fkie_cve-2026-54298 <p>Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro&#39;s server-side rendering pipeline iterates over object keys and passes them directly to addAttribute, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax {...props} on an HTML element and the object keys come from an untrusted source (API, CMS, URL parameters), an attacker can inject arbitrary HTML attributes including event handlers like onmousemove, onclick, or break out of the attribute context entirely to inject new elements. This vulnerability is fixed in 6.4.6.</p> <p>Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro&#39;s server-side rendering pipeline iterates over object keys and passes them directly to addAttribute, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax {...props} on an HTML element and the object keys come from an untrusted source (API, CMS, URL parameters), an attacker can inject arbitrary HTML attributes including event handlers like onmousemove, onclick, or break out of the attribute context entirely to inject new elements. This vulnerability is fixed in 6.4.6.</p> https://db.gcve.eu/vuln/fkie_cve-2026-54298 https://db.gcve.eu/vuln/ghsa-jrpj-wcv7-9fh9 <p><strong>Affected:</strong> npm: astro</p> <p>## Summary</p> <p>The `spreadAttributes` function in Astro&#39;s server-side rendering pipeline iterates over object keys and passes them directly to `addAttribute`, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax `{...props}` on an HTML element and the object keys come from an untrusted source (API, CMS, URL parameters), an attacker can inject arbitrary HTML attributes including event handlers like `onmousemove`, `onclick`, or break out of the attribute context entirely to inject new elements.</p> <p>## Details</p> <p>The vulnerable function is [`addAttribute`](https://github.com/withastro/astro/blob/main/packages/astro/src/runtime/server/render/util.ts#L81-L141) at `packages/astro/src/runtime/server/render/util.ts:81-141`:</p> <p>```javascript export function addAttribute(value: any, key: string, shouldEscape = true, tagName = &#39;&#39;) { if (value == null) { return &#39;&#39;; } return markHTMLString(` ${key}=&#34;${toAttributeString(value, shouldEscape)}&#34;`); // key interpolated not escaped } ```</p> <p>This function is called from [`spreadAttributes`](https://github.com/withastro/astro/blob/main/packages/astro/src/runtime/server/index.ts#L91-L92) at `packages/astro/src/runtime/server/index.ts:91-92`:</p> <p>```javascript for (const [key, value] of Object.entries(values)) { output += addAttribute(value, key, true, _name); } ```</p> <p>The `toAttributeString` function escapes the attribute value, but the attribute name `key` is never validated or es…</p> <p><strong>Affected:</strong> npm: astro</p> <p>## Summary</p> <p>The `spreadAttributes` function in Astro&#39;s server-side rendering pipeline iterates over object keys and passes them directly to `addAttribute`, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax `{...props}` on an HTML element and the object keys come from an untrusted source (API, CMS, URL parameters), an attacker can inject arbitrary HTML attributes including event handlers like `onmousemove`, `onclick`, or break out of the attribute context entirely to inject new elements.</p> <p>## Details</p> <p>The vulnerable function is [`addAttribute`](https://github.com/withastro/astro/blob/main/packages/astro/src/runtime/server/render/util.ts#L81-L141) at `packages/astro/src/runtime/server/render/util.ts:81-141`:</p> <p>```javascript export function addAttribute(value: any, key: string, shouldEscape = true, tagName = &#39;&#39;) { if (value == null) { return &#39;&#39;; } return markHTMLString(` ${key}=&#34;${toAttributeString(value, shouldEscape)}&#34;`); // key interpolated not escaped } ```</p> <p>This function is called from [`spreadAttributes`](https://github.com/withastro/astro/blob/main/packages/astro/src/runtime/server/index.ts#L91-L92) at `packages/astro/src/runtime/server/index.ts:91-92`:</p> <p>```javascript for (const [key, value] of Object.entries(values)) { output += addAttribute(value, key, true, _name); } ```</p> <p>The `toAttributeString` function escapes the attribute value, but the attribute name `key` is never validated or es…</p> https://db.gcve.eu/vuln/ghsa-jrpj-wcv7-9fh9