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CVE-2025-59934— Formbricks missing JWT signature verification

Quick assessment

Affected
formbricks formbricks
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

formbricks是Formbricks开源的一个调查系统。 formbricks 4.0.1之前版本存在数据伪造问题漏洞，该漏洞源于缺少JWT签名验证，可能导致任意JWT伪造和密码重置。

CVSS 9.4 · Critical EPSS 8.07% · P95
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I. Basic Information for CVE-2025-59934

Vulnerability Information
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Vulnerability Title
Formbricks missing JWT signature verification
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
formbricks 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
formbricks是Formbricks开源的一个调查系统。 formbricks 4.0.1之前版本存在数据伪造问题漏洞，该漏洞源于缺少JWT签名验证，可能导致任意JWT伪造和密码重置。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
formbricks formbricks < 4.0.1 -

II. Public POCs for CVE-2025-59934

# POC Description Source Link Shenlong Link
1 cve-2025-59934 PoC https://github.com/suriryuk/cve-2025-59934 POC Details
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III. Intelligence Information for CVE-2025-59934

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IV. Related Vulnerabilities

Same product: formbricks
Same vendor: formbricks
Same weakness: CWE-347

V. Comments for CVE-2025-59934

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