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CVE-2025-59934

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Date: September 26, 2025

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.

Severity Score

Severity Score

Weakness Type (CWE)

Improper Authentication

CWE-287

Improper Verification of Cryptographic Signature

CWE-347

Insufficient Verification of Data Authenticity

CWE-345

Top Fix

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Upgrade Version

Upgrade to version https://github.com/formbricks/formbricks.git - 4.0.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): LOW

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