CVE-2026-27118

CVE-2026-27118 affects the SvelteKit adapter for Vercel: versions prior to 6.3.2 are vulnerable to cache poisoning due to an internal ISR query parameter that is exposed on all routes. An attacker can trigger caching of sensitive user-specific responses to other users if a victim visits a crafted...

Svelte 跨站脚本漏洞

Svelte is an open-source approach to building web applications developed by Svelte. Versions of Svelte prior to 5.51.5 contained a cross-site scripting vulnerability. This vulnerability stemmed from the lack of validation or cleanup of tag names during server-side rendering, which could lead to...

Svelte 跨站脚本漏洞

Svelte is an open-source approach to building web applications developed by Svelte. Versions of Svelte prior to 5.51.5 contained a cross-site scripting vulnerability. This vulnerability occurred when extended syntax was used during server-side rendering, and event handler properties were included...

Svelte 安全漏洞

Svelte is an open-source approach to building web applications developed by Svelte. Versions of Svelte prior to 5.51.5 have a security vulnerability. This vulnerability arises from server-side rendering, where property extensions enumerate inherited properties, which may lead to unexpected proper...

Svelte 跨站脚本漏洞

Svelte is an open-source approach to building web applications. Versions of Svelte from 5.39.3 to 5.51.4 have a cross-site scripting vulnerability. This vulnerability stems from improper escaping of content in server-side rendering outputs, which may lead to HTML injection...

PT-2026-21307

svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements e.g. enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a...

Improperly Controlled Modification of Dynamically-Determined Object Attributes

Overview svelte is a package for building web applications. Affected versions of this package are vulnerable to Improperly Controlled Modification of Dynamically-Determined Object Attributes in server-side rendering when attribute spreading is performed on elements. An attacker can inject...

@budibase/server (>=3.32.1, <=3.38.1), @builders-of-stuff/svelte-sui-wallet-adapter (>=0.6.6, <=2.1.0) +52 more potentially affected by CVE-2026-27125 via svelte (>=5.0.0, <=5.51.2)

svelte NPM version =5.0.0, =3.32.1, =0.6.6, =4.0.0-alpha.1, =4.0.0-alpha.1, =0.1.0, =0.0.1, =1.3.0, =0.1.4, =0.0.20, =0.15.0-beta.2, =1.1.0-beta.0, =5.0.0-next.80, =0.1.1-alpha.24, =0.1.3-next.2 and more Source cves: CVE-2026-27125 Source advisory: SNYK:JS-SVELTE-15322714...

Improperly Controlled Modification of Dynamically-Determined Object Attributes

Overview org.webjars.npm:svelte is a package for building web applications. Affected versions of this package are vulnerable to Improperly Controlled Modification of Dynamically-Determined Object Attributes in server-side rendering when attribute spreading is performed on elements. An attacker ca...

@budibase/server (>=3.32.1, <=3.38.1), @builders-of-stuff/svelte-sui-wallet-adapter (>=0.6.6, <=2.1.0) +52 more potentially affected by CVE-2026-27125 via svelte (>=5.0.0, <=5.51.2)

svelte NPM version =5.0.0, =3.32.1, =0.6.6, =4.0.0-alpha.1, =4.0.0-alpha.1, =0.1.0, =0.0.1, =1.3.0, =0.1.4, =0.0.20, =0.15.0-beta.2, =1.1.0-beta.0, =5.0.0-next.80, =0.1.1-alpha.24, =0.1.3-next.2 and more Source cves: CVE-2026-27125 Source advisory: OSV:GHSA-CRPF-4HRX-3JRP...

@budibase/server (>=3.32.1, <=3.38.1), @builders-of-stuff/svelte-sui-wallet-adapter (>=0.6.6, <=2.1.0) +52 more potentially affected by CVE-2026-27122 via svelte (>=5.0.0, <=5.51.2)

svelte NPM version =5.0.0, =3.32.1, =0.6.6, =4.0.0-alpha.1, =4.0.0-alpha.1, =0.1.0, =0.0.1, =1.3.0, =0.1.4, =0.0.20, =0.15.0-beta.2, =1.1.0-beta.0, =5.0.0-next.80, =0.1.1-alpha.24, =0.1.3-next.2 and more Source cves: CVE-2026-27122 Source advisory: SNYK:JS-SVELTE-15322733...

@budibase/server (>=3.32.1, <=3.38.1), @builders-of-stuff/svelte-sui-wallet-adapter (>=0.6.6, <=2.1.0) +52 more potentially affected by CVE-2026-27122 via svelte (>=5.0.0, <=5.51.2)

svelte NPM version =5.0.0, =3.32.1, =0.6.6, =4.0.0-alpha.1, =4.0.0-alpha.1, =0.1.0, =0.0.1, =1.3.0, =0.1.4, =0.0.20, =0.15.0-beta.2, =1.1.0-beta.0, =5.0.0-next.80, =0.1.1-alpha.24, =0.1.3-next.2 and more Source cves: CVE-2026-27122 Source advisory: OSV:GHSA-M56Q-VW4C-C2CP...

Svelte SSR does not validate dynamic element tag names in `<svelte:element>`

When using in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected...

Cross-site Scripting (XSS)

Overview svelte is a package for building web applications. Affected versions of this package are vulnerable to Cross-site Scripting XSS via the svelte:element tags. An attacker can inject arbitrary HTML into the server-side rendered output by supplying a crafted tag name. Details Cross-site...

GHSA-M56Q-VW4C-C2CP Svelte SSR does not validate dynamic element tag names in `<svelte:element>`

When using in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected...

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 via the svelte:element tags. An attacker can inject arbitrary HTML into the server-side rendered output by supplying a crafted tag name. Details...

@budibase/server (>=3.32.1, <=3.38.1), @builders-of-stuff/svelte-sui-wallet-adapter (>=0.6.6, <=2.1.0) +52 more potentially affected by CVE-2026-27121 via svelte (>=5.0.0, <=5.51.2)

svelte NPM version =5.0.0, =3.32.1, =0.6.6, =4.0.0-alpha.1, =4.0.0-alpha.1, =0.1.0, =0.0.1, =1.3.0, =0.1.4, =0.0.20, =0.15.0-beta.2, =1.1.0-beta.0, =5.0.0-next.80, =0.1.1-alpha.24, =0.1.3-next.2 and more Source cves: CVE-2026-27121 Source advisory: OSV:GHSA-F7GR-6P89-R883...

GHSA-F7GR-6P89-R883 Svelte affected by cross-site scripting via spread attributes in Svelte SSR

Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting XSS during server-side rendering. 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...

Svelte affected by cross-site scripting via spread attributes in Svelte SSR

Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting XSS during server-side rendering. 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...

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 via the spread syntax when rendering attributes from untrusted data during server-side rendering. An attacker can execute arbitrary JavaScript i...