CVE-2025-599349.4CriticalCWE-347

CVE-2025-59934: Formbricks missing JWT signature verification

formbricks

Affected: formbricks · Exploitation: likely to be exploited (10% or more)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

10.0%probability of exploitation in the next 30 days

95th percentile

050100

Higher than 95% of scored CVEs

9.4CriticalCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

formbricks · formbricks< 4.0.1

On the Atlas

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Open the Atlas

Exploitation: Likely to be exploited (10% or more). EPSS gives it a 10% or higher chance of exploitation in the next 30 days.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Improper Verification of Cryptographic Signature · Cryptography
Published: September 2025
Band: Likely to be exploited (10% or more), September 2025

CoverageNo articles yet

No CyberSIXT article names CVE-2025-59934 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.