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Vulnerabilities

Security incident · CVE-2025-59934

Formbricks is an open source qualtrics alternative.

Published Sep 26, 2025 · catalog updated Sep 29, 2025 · Formbricks is an open

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-59934. EPSS is 9.14%. Act only if a listed version of Formbricks is an open is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Formbricks is an open).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
9.14%
Remediation
Version ranges on file
Affected products
vendor formbricks formbricks < 4.0.1

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 pa

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor formbricks formbricks < 4.0.1< 4.0.1

How to fix CVE-2025-59934

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-59934. EPSS is 9.14%. Act only if a listed version of Formbricks is an open is installed.

Which versions are affected?

Compare what you have installed with formbricks formbricks < 4.0.1 < 4.0.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 9.14%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 26, 2025 · EUVD

    Detected

    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 signat

  2. Sep 29, 2025 · EUVD

    Updated

    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 signat

Sources

  • CVE.orgVulnerability recordCVE-2025-59934

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-59934

    30-day exploitation probability 9.14%

    first.org
  • EUVDVulnerability recordEUVD-2025-31394

    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 verificati

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 29, 2026
  • CVE.orgOct 23, 2026
  • EUVDOct 23, 2026