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Public vulnerability disclosure

CVE-2026-19677

Authentication Bypass Leading to Server-Side Command Execution

publishedCWE-306

An authentication bypass vulnerability in the public onPhase/ frevvo registration form version 11.0.14 allows an unauthenticated remote attacker to authenticate as an arbitrary tenant user, obtain TenantAdmin and Designer privileges, and execute arbitrary operating system commands via manipulation of registration parameters containing a valid tenant name and existing user identifier.

Investigate in Cyber JSONMarkdown
Technical severity9.3 criticalCVSS 4.0 · CNA: MON-CSIRT
Published2026-10-23Source updated 2026-11-02
Collected2026-11-022 attributed sources

Fixes and workarounds

Fix

* Upgrade to 11.0.17 * The unauthenticated registration endpoint has been removed. * Rules run in a sandbox that blocks access to unapproved Java classes. * The Document Service endpoint (/service) is disabled by default (frevvo.documentServiceApi.enabled=false). Re-enabling it brings back the risk of server-side request forgery and is done at the customer's own risk. * Customers who cannot upgrade immediately should block /frevvo/web/webapp/register and /frevvo/web/**/service at their reverse proxy or web application firewall.

Source: CNA: MON-CSIRT

Affected products and versions

ProductVersionsAuthority
onPhase Forms
onPhase 		11.0.14 (affected)
Other versions: unaffected 		CNA: MON-CSIRT

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

Version / scoreVectorAuthority
4.0 / 9.3
critical		 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NCNA: MON-CSIRT

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References