What is the CVSS score of CVE-2025-59934?

CVE-2025-59934 has a CVSS 3.1 base score of 9.4 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L. EPSS exploitation probability: 0.0%.

Which versions of Formbricks are affected by CVE-2025-59934?

Organizations using Formbricks face critical risk from CVE-2025-59934, a improper authentication vulnerability rated CVSS 9.4.

How to fix or mitigate CVE-2025-59934?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Audit authentication configurations and rotate any potentially compromised credentials.

Formbricks CVE-2025-59934

CRITICAL

Improper Authentication (CWE-287)

2025-09-26 security-advisories@github.com

Authentication Bypass

9.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.4 CRITICAL

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:14 vuln.today

CVE Published

Sep 26, 2025 - 23:15 nvd

CRITICAL 9.4

DescriptionGitHub Advisory

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.

AnalysisAI

Formbricks is an open source qualtrics alternative. Rated critical severity (CVSS 9.4), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. 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. Version information: version 4.0.1.

Affected ProductsAI

See vendor advisory for affected versions.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.