Formbricks missing JWT signature verification_CVE-2025-59934

9.4 / 10

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

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.

Basic Information

ID CVE-2025-59934

Source GitHub_M

Published Sep 26, 2025 at 23:03

Affected Product

Vendor formbricks

Product formbricks

Version < 4.0.1

Affected Versions formbricks formbricks < 4.0.1

CWE Classification

CWE-347 CWE-345 CWE-287

References

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    "published": "2025-09-26T23:03:30.995Z",
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