EUVD-2026-49584

Astro is a web framework for content-driven websites. In versions 1.0.0 through 4.0.18, the source.title and enclosure.type item fields in packages/astro-rss/src/index.ts are interpolated directly into XML template strings without XML-character escaping before being parsed by fast-xml-parser. Bot...

CVE-2026-59728 @astrojs/rss: XML Injection via Unescaped RSS Feed Fields

Astro is a web framework for content-driven websites. In versions 1.0.0 through 4.0.18, the source.title and enclosure.type item fields in packages/astro-rss/src/index.ts are interpolated directly into XML template strings without XML-character escaping before being parsed by fast-xml-parser. Bot...

CVE-2026-59727 Astro: Cross-site scripting via unescaped transition:* directive values on hydrated islands

Astro is a web framework for content-driven websites. In versions 3.10.0 through 7.0.3, when a transition:persist, transition:scope, or transition:persist-props directive is applied to a client-hydrated client: component, Astro copied the directive value onto the rendered element without...

CVE-2026-59727 Astro: Cross-site scripting via unescaped transition:* directive values on hydrated islands

Astro is a web framework for content-driven websites. In versions 3.10.0 through 7.0.3, when a transition:persist, transition:scope, or transition:persist-props directive is applied to a client-hydrated client: component, Astro copied the directive value onto the rendered element without...

CVE-2026-59727

CVE-2026-59727 (Astro): In versions 3.10.0–7.0.3, unescaped values copied from transition:persist, transition:scope, or transition:persist-props into the rendered element enable reflected XSS if an attacker-controlled input is reflected into these directives. The issue arises when untrusted inpu...

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...

EUVD-2026-49580

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-2026-59728

creationtimestamp| type| source ---|---|--- 2026-07-21 00:35:03+00:00| published-proof-of-concept| https://github.com/withastro/astro/security/advisories/GHSA-8j5q-mfj2-5q9q...

Astro: composable `astro/hono` pipeline bypasses `security.checkOrigin` when `middleware()` is absent or misordered

Summary In the composable astro/hono pipeline, the security.checkOrigin protection is only installed by the middleware primitive. The actions and pages primitives each dispatch to user code independently, so a pipeline that mounts either primitive before or without middleware will bypass the orig...

GHSA-8MV7-9C27-98VC Astro: composable `astro/hono` pipeline bypasses `security.checkOrigin` when `middleware()` is absent or misordered

Summary In the composable astro/hono pipeline, the security.checkOrigin protection is only installed by the middleware primitive. The actions and pages primitives each dispatch to user code independently, so a pipeline that mounts either primitive before or without middleware will bypass the orig...

GHSA-X27W-589X-FRM2 Astro: Unauthenticated path override in the @astrojs/vercel ISR function

Summary When ISR is enabled, the serverless entrypoint lets an unauthenticated request decide which route the origin renders. The internal isr function reads the xastropath query parameter and rewrites the request path to it without any authentication. Edge level access controls only ever see the...

Astro: Unauthenticated path override in the @astrojs/vercel ISR function

Summary When ISR is enabled, the serverless entrypoint lets an unauthenticated request decide which route the origin renders. The internal isr function reads the xastropath query parameter and rewrites the request path to it without any authentication. Edge level access controls only ever see the...

GHSA-R557-WFFQ-WVRC @astrojs/node: Backslash-prefixed paths not recognized as internal by trailing-slash redirect

Impact With trailingSlash: 'always' configured, the @astrojs/node standalone server's static file handler appends a trailing slash to request paths and issues a 301 redirect. Paths beginning with /\ slash-backslash were not recognized as internal paths, so the handler would echo the raw path back...

Open Redirect

Overview @astrojs/internal-helpers is an Internal helpers used by core Astro packages. Affected versions of this package are vulnerable to Open Redirect via the static file handler when the trailingSlash: 'always' configuration is enabled. An attacker can redirect users to unintended external sit...

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...

Cross-site Scripting (XSS)

Overview astro is an Astro is a modern site builder with web best practices, performance, and DX front-of-mind. Affected versions of this package are vulnerable to Cross-site Scripting XSS via the renderHTMLElement function. An attacker can inject arbitrary event-handler attributes or sibling...

GHSA-F48W-9M4C-M7F5 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...

GHSA-8J5Q-MFJ2-5Q9Q @astrojs/rss: XML Injection via Unescaped RSS Feed Fields

Summary In @astrojs/rss, the source.title and enclosure.type item fields are interpolated directly into XML template strings without XML-character escaping before being parsed by fast-xml-parser. An attacker who controls these field values can inject arbitrary XML elements into the generated RSS...

Improper Encoding or Escaping of Output

Overview astro is an Astro is a modern site builder with web best practices, performance, and DX front-of-mind. Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output via the transition:persist, transition:scope, or transition:persist-props directives when...