Frappe up to 15.115.x/16.28.x OAuth Login Flow state redirect

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Frappe up to 15.115.x/16.28.x. This affects an unknown part of the component OAuth Login Flow. This manipulation of the argument state causes redirect. The identification of this vulnerability is CVE-2026-66057. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Frappe up to 15.115.x/16.28.x. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the component OAuth Login Flow. The manipulation of the argument state 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:

Frappe is a full-stack web application framework. Prior to 15.116.0 and 16.29.0, the OAuth login flow uses an unsanitized client-controlled state parameter to select post-authentication navigation, allowing a crafted state value to redirect a user to an attacker-chosen location. This issue is fixed in versions 15.116.0 and 16.29.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-66057 since 07/24/2026. 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 of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1204.001 according to MITRE ATT&CK.

Upgrading to version 15.116.0 or 16.29.0 eliminates this vulnerability.

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Productinfo

Name

• Frappe

Version

• 15.115
• 16.0
• 16.1
• 16.2
• 16.3
• 16.4
• 16.5
• 16.6
• 16.7
• 16.8
• 16.9
• 16.10
• 16.11
• 16.12
• 16.13
• 16.14
• 16.15
• 16.16
• 16.17
• 16.18
• 16.19
• 16.20
• 16.21
• 16.22
• 16.23
• 16.24
• 16.25
• 16.26
• 16.27
• 16.28

Website

• Product: https://github.com/frappe/frappe/

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