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Cross-Site Request Forgery (CSRF)


Severity High
Score 8.8/10


The SvelteKit framework offers developers an option to create simple REST APIs. This is done by defining a "+server.js" file, containing endpoint handlers for different HTTP methods. SvelteKit provides out-of-the-box cross-site request forgery (CSRF) protection to its users. The protection is implemented at "kit/src/runtime/server/respond.js". While the implementation does a sufficient job of mitigating common CSRF attacks, the protection can be bypassed in versions prior to 1.15.2 by simply specifying an upper-cased "Content-Type" header value. The browser will not send uppercase characters, but this check does not block all expected CORS requests. If abused, this issue will allow malicious requests to be submitted from third-party domains, which can allow execution of operations within the context of the victim's session, and in extreme scenarios can lead to unauthorized access to users’ accounts. This may lead to all POST operations requiring authentication being allowed in the following cases: If the target site sets "SameSite=None" on its auth cookie and the user visits a malicious site in a Chromium-based browser; if the target site doesn't set the "SameSite" attribute explicitly and the user visits a malicious site with Firefox/Safari with tracking protections turned off; and/or if the user is visiting a malicious site with a very outdated browser. It is also recommended to explicitly set "SameSite" to a value other than "None" on authentication cookies especially if the upgrade cannot be done in a timely manner.

  • LOW
  • HIGH
  • NONE
  • HIGH
  • HIGH

CWE-352 - Cross-Site Request Forgery (CSRF)

Cross-Site Request Forgery (CSRF) is a vulnerability that allows an attacker to make arbitrary requests in an authenticated vulnerable web application and disrupt the integrity of the victim’s session. The impact of a successful CSRF attack may range from minor to severe, depending upon the capabilities exposed by the vulnerable application and privileges of the user. An attacker may force the user to perform state-changing requests like transferring funds, changing their email address or password etc. However, if an administrative level account is affected, it may compromise the whole web application and associated sensitive data.

Advisory Timeline

  • Published