sveltejs kit up to 7.2.9/8.0.1 adapter-cloudflare redirect

Summaryinfo

A vulnerability was found in sveltejs kit up to 7.2.9/8.0.1 and classified as problematic. Affected by this vulnerability is an unknown functionality of the component adapter-cloudflare. Such manipulation leads to redirect. This vulnerability is traded as CVE-2026-128122. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in sveltejs kit up to 7.2.9/8.0.1. Affected by this issue is an unknown code of the component adapter-cloudflare. The manipulation with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. Impacted is integrity. CVE summarizes:

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From version 4.7.0 until versions 7.2.10 and 8.0.2, @sveltejs/adapter-cloudflare allowed an attacker-influenced link crawled during prerendering to place whitespace, control characters, wildcards, or placeholders into a prerendered redirect path. The adapter wrote those paths into the Cloudflare _redirects output without output-context validation, allowing a path to create unintended routing rules that could redirect or expose requests beyond the intended prerendered route. This issue is fixed in 7.2.10 and 8.0.2.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-128122 since 11/12/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1204.001 by the MITRE ATT&CK project.

Upgrading to version 7.2.10 or 8.0.2 eliminates this vulnerability.

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Productinfo

Vendor

• sveltejs

Name

• kit

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5
• 7.2.6
• 7.2.7
• 7.2.8
• 7.2.9
• 8.0.0
• 8.0.1

Website

• Product: https://github.com/sveltejs/kit/

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