CVE-2025-59934
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-26

Last updated on: 2025-09-29

Assigner: GitHub, Inc.

Description
Formbricks is an open source qualtrics alternative. Prior to version 4.0.1, Formbricks is missing JWT signature verification. This vulnerability stems from a token validation routine that only decodes JWTs (jwt.decode) without verifying their signatures. Both the email verification token login path and the password reset server action use the same validator, which does not check the token’s signature, expiration, issuer, or audience. If an attacker learns the victim’s actual user.id, they can craft an arbitrary JWT with an alg: "none" header and use it to authenticate and reset the victim’s password. This issue has been patched in version 4.0.1.
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Meta Information
Published
2025-09-26
Last Modified
2025-09-29
Generated
2026-06-16
AI Q&A
2025-09-27
EPSS Evaluated
2026-06-15
NVD
CVE-2025-59934
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
formbricks formbricks *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.
CWE-345 The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
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Executive Summary

This vulnerability in Formbricks prior to version 4.0.1 involves missing JWT signature verification. The token validation routine only decodes JWTs without verifying their signatures, expiration, issuer, or audience. An attacker who knows a victim's user ID can craft a JWT with an 'alg: none' header to bypass authentication and reset the victim's password.

Impact Analysis

An attacker can exploit this vulnerability to authenticate as a victim and reset their password without proper authorization. This can lead to unauthorized access to user accounts, compromising confidentiality, integrity, and availability of user data.

Mitigation Strategies

Upgrade Formbricks to version 4.0.1 or later, as this version includes a patch that properly verifies JWT signatures and addresses the vulnerability.

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