Onlook Web Application 0.2.32 Header X-Forwarded-Host redirect

Summaryinfo

A vulnerability has been found in Onlook Web Application 0.2.32 and classified as problematic. This affects an unknown function of the component Header Handler. This manipulation of the argument X-Forwarded-Host causes redirect. This vulnerability is tracked as CVE-2025-63784. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Onlook Web Application 0.2.32 and classified as problematic. Affected by this vulnerability is an unknown part of the component Header Handler. The manipulation of the argument X-Forwarded-Host with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. As an impact it is known to affect integrity. The summary by CVE is:

An Open Redirect vulnerability exists in the OAuth callback handler in file onlook/apps/web/client/src/app/auth/callback/route.ts in Onlook web application 0.2.32. The vulnerability occurs because the application trusts the X-Forwarded-Host header value without proper validation when constructing a redirect URL. A remote attacker can send a manipulated X-Forwarded-Host header to redirect an authenticated user to an arbitrary external website under their control, which can be exploited for phishing attacks.

The advisory is shared at tossbank.notion.site. This vulnerability is known as CVE-2025-63784 since 10/27/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/07/2025). MITRE ATT&CK project uses the attack technique T1204.001 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Onlook Web Application

Version

• 0.2.32

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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