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CVE-2026-19677 – Authentication Bypass leading to RCE – onPhase Forms 11.0.14

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Summary

CVE-2026-19677 is a critical authentication bypass (CWE-306, Missing Authentication for Critical Function) in the registration form of onPhase Forms (formerly frevvo) version 11.0.14. An unauthenticated remote attacker can impersonate tenant users, gain TenantAdmin and Designer privileges, and execute arbitrary operating system commands. The CVSS score is 9.3 (Critical).

Technical details

  • Root cause: the public registration form lacks proper authentication for a critical function (CWE-306).
  • Trigger conditions: the attacker supplies manipulated registration parameters that contain a valid tenant name and an existing user identifier.
  • Attack vector: network. No authentication or user interaction is required, and attack complexity is low.
  • Impact: impersonation of arbitrary tenant users, escalation to TenantAdmin and Designer roles, and arbitrary OS command execution on the server.

Affected software

  • onPhase Forms 11.0.14

Severity

  • CVSS v4.0 base score: 9.3 (Critical)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: upgrade to onPhase Forms 11.0.17. Per the advisory text, this release removes the unauthenticated registration endpoint, sandboxes rules so they cannot reach unapproved Java classes, and disables the Document Service (/service) endpoint by default.
  • If you cannot upgrade immediately: block /frevvo/web/webapp/register and /frevvo/web/**/service at the firewall, reverse proxy or WAF until you can patch.
  • Re-enabling the /service endpoint after the upgrade brings back server-side request forgery risk, so leave it disabled unless you need it.

References

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