CVE-2024-53261: Cross-Site Scripting attack (XSS) on dev mode 404 page in SvelteKit
Summary
"Unsanitized input from the request URL flows into end, where it is used to render an HTML page returned to the user. This may result in a Cross-Site Scripting attack (XSS)."
Details
Source of potentially tainted data is in packages/kit/src/exports/vite/dev/index.js, line 437. This potentially tainted data is passed through a number of steps (which I could detail if you'd like) all the way down to line 91 in packages/kit/src/exports/vite/utils.js, which performs an operation that Snyk believes an attacker shouldn't be allowed to manipulate.
Another source of potentially tainted data (according to Snyk) comes from packages/kit/src/exports/vite/utils.js, line 30, col 30 (i.e., the url property of req). This potentially tainted data is passed through a number of steps (which I could detail if you'd like) all the way down line 91 in packages/kit/src/exports/vite/utils.js, which performs an operation that Snyk believes an attacker shouldn't be allowed to manipulate.
PoC
Not provided
Impact
Little to none. The Vite development is not exposed to the network by default. And even if someone were able to trick a developer into executing an XSS against themselves, a development database should not have any sensitive data.
Other sources
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. "Unsanitized input from the request URL flows into end, where it is used to render an HTML page returned to the user. This may result in a Cross-Site Scripting attack (XSS)." The files packages/kit/src/exports/vite/dev/index.js and packages/kit/src/exports/vite/utils.js both contain user controllable data which under specific conditions may flow to dev mode pages. There is little to no expected impact. The Vite development is not exposed to the network by default and even if someone were able to trick a developer into executing an XSS against themselves, a development database should not have any sensitive data. None the less this issue has been addressed in version 2.8.3 and all users are advised to upgrade.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-53261?
CVE-2024-53261 is classified as a medium severity vulnerability due to the potential for Cross-Site Scripting (XSS) attacks.
How do I fix CVE-2024-53261?
To fix CVE-2024-53261, update the affected package @sveltejs/kit to version 2.8.3 or later.
What are the consequences of exploiting CVE-2024-53261?
Exploiting CVE-2024-53261 can lead to unauthorized access to user data or session hijacking through XSS attacks.
Which software is affected by CVE-2024-53261?
CVE-2024-53261 affects the @sveltejs/kit package versions before 2.8.3.
When was CVE-2024-53261 reported?
CVE-2024-53261 was reported as a vulnerability affecting the @sveltejs/kit package.