CVE-2025-59934
Formbricks missing JWT signature verification
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.
INFO
Published Date :
Sept. 26, 2025, 11:15 p.m.
Last Modified :
Sept. 29, 2025, 7:34 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-59934
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Formbricks to version 4.0.1.
- Apply necessary security patches promptly.
- Validate JWT signatures rigorously.
- Ensure proper token validation routines.
Public PoC/Exploit Available at Github
CVE-2025-59934 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-59934.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-59934 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-59934
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
cve-2025-59934 PoC
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-59934 vulnerability anywhere in the article.
-
Daily CyberSecurity
Critical Auth Bypass (CVE-2025-61928) in Better Auth Allows Hackers to Steal User API Keys
A critical authentication bypass vulnerability has been discovered in Better Auth, a popular framework-agnostic authentication and authorization library for TypeScript, used by developers to add secur ... Read more
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The Hacker News
⚡ Weekly Recap: Oracle 0-Day, BitLocker Bypass, VMScape, WhatsApp Worm & More
The cyber world never hits pause, and staying alert matters more than ever. Every week brings new tricks, smarter attacks, and fresh lessons from the field. This recap cuts through the noise to share ... Read more
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CybersecurityNews
Formbricks Signature Verification Vulnerability Let Attackers Reset User Passwords Without Authorization
A critical security flaw discovered in Formbricks, an open-source experience management platform, demonstrates how missing JWT signature verification can lead to complete account takeovers. The vulner ... Read more
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Daily CyberSecurity
CVE-2025-59934: Critical Flaw in Formbricks Allows Unauthorized Password Resets via Forged JWT Tokens
The Formbricks project, an open-source platform for building in-app and website surveys, has released an urgent patch addressing a critical authentication vulnerability. Tracked as CVE-2025-59934 with ... Read more
The following table lists the changes that have been made to the
CVE-2025-59934 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Sep. 26, 2025
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L Added CWE CWE-287 Added CWE CWE-345 Added CWE CWE-347 Added Reference https://github.com/formbricks/formbricks/blob/843110b0d6c37b5c0da54291616f84c91c55c4fc/apps/web/lib/jwt.ts#L114-L117 Added Reference https://github.com/formbricks/formbricks/commit/eb1349f205189d5b2d4a95ec42245ca98cf68c82 Added Reference https://github.com/formbricks/formbricks/pull/6596 Added Reference https://github.com/formbricks/formbricks/security/advisories/GHSA-7229-q9pv-j6p4