CVE-2026-59729

Astro is a web framework for content-driven websites. Versions prior to 7.0.6 are vulnerable to XSS through unescaped spread attribute names in renderHTMLElement. The fix for CVE-2026-54298 GHSA-jrpj-wcv7-9fh9 added an INVALIDATTRNAMECHAR guard to addAttribute so that spread-prop attribute names...

CVE-2026-59729 Astro: XSS via unescaped spread attribute names in renderHTMLElement (incomplete fix for CVE-2026-54298)

Astro is a web framework for content-driven websites. Versions prior to 7.0.6 are vulnerable to XSS through unescaped spread attribute names in renderHTMLElement. The fix for CVE-2026-54298 GHSA-jrpj-wcv7-9fh9 added an INVALIDATTRNAMECHAR guard to addAttribute so that spread-prop attribute names...

CVE-2026-59729

CVE-2026-59729 affects Astro versions prior to 7.0.6, where unescaped spread attribute names in renderHTMLElement can lead to XSS in SSR when rendering a native HTMLElement-subclass component. The root cause is an inline attribute loop in renderHTMLElement that interpolates attribute names withou...

NPM: Astro: XSS via unescaped spread attribute names in renderHTMLElement (incomplete fix for CVE-2026-54298)

NPM: Astro: XSS via unescaped spread attribute names in renderHTMLElement incomplete fix for CVE-2026-54298 vulnerability discovered by ? in WordPress Npm astro versions 7.0.6...

Astro: XSS via unescaped spread attribute names in renderHTMLElement (incomplete fix for CVE-2026-54298)

Summary The fix for CVE-2026-54298 GHSA-jrpj-wcv7-9fh9 added an INVALIDATTRNAMECHAR guard to addAttribute so that spread-prop attribute names containing "' /= or whitespace are dropped. A second attribute-rendering path, renderHTMLElement in packages/astro/src/runtime/server/render/dom.ts, has it...

CVE-2026-54298 Astro: XSS via Unescaped Attribute Names in Spread Props

Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro'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 ...

CVE-2026-54298 Astro: XSS via Unescaped Attribute Names in Spread Props

Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro'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 ...

CVE-2026-54298

Astro, prior to 6.4.6, is vulnerable to XSS via unescaped attribute names when spreading props onto HTML elements. The spreadAttributes path iterates over object keys and passes them to addAttribute, which interpolates the key into the HTML output without escaping, allowing attackers to inject ev...

Cross-site Scripting (XSS)

Astro is vulnerable to Cross-Site Scripting XSS. The vulnerability is due to improper escaping of user-controlled attribute names in the spreadAttributes function during server-side rendering, which allows an attacker to inject arbitrary HTML attributes, event handlers, or malicious HTML content...

GHSA-JRPJ-WCV7-9FH9 Astro: XSS via Unescaped Attribute Names in Spread Props

Summary The spreadAttributes function in Astro'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...

PT-2026-49739

Name of the Vulnerable Software and Affected Versions Astro versions prior to 6.4.6 Description The spreadAttributes function in the server-side rendering pipeline iterates over object keys and passes them to the addAttribute function, which interpolates the key into the HTML output without...

CVE-2026-42599

Svelte is a performance oriented web framework. Prior to version 5.55.7, when using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an...

CVE-2026-42599 Cross-site scripting via spread attributes in Svelte SSR

Svelte is a performance oriented web framework. Prior to version 5.55.7, when using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an...

CVE-2026-42599 Cross-site scripting via spread attributes in Svelte SSR

Svelte is a performance oriented web framework. Prior to version 5.55.7, when using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an...

CVE-2026-42599 Cross-site scripting via spread attributes in Svelte SSR

Svelte is a performance oriented web framework. Prior to version 5.55.7, when using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an...

CVE-2026-42599

CVE-2026-42599 affects Svelte SSR. Prior to version 5.55.7, using spread syntax to render attributes from untrusted data may include event handler properties in the rendered HTML, enabling attackers to inject malicious event handlers that run in victims’ browsers if JavaScript is enabled and hydr...

GHSA-PR6F-5X2Q-RWFP Svelte SSR vulnerable to cross-site scripting via spread attributes

When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers...

NPM: Svelte SSR vulnerable to cross-site scripting via spread attributes

NPM: Svelte SSR vulnerable to cross-site scripting via spread attributes vulnerability discovered by ? in WordPress Npm svelte versions = 5.55.6...

Cross-site Scripting (XSS)

Overview org.webjars.npm:svelte is a package for building web applications. Affected versions of this package are vulnerable to Cross-site Scripting XSS in the rendering of attributes using spread syntax from untrusted data, which includes event handler properties in the HTML output. An attacker...

Svelte SSR vulnerable to cross-site scripting via spread attributes

When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers...