CVE-2026-19677 PUBLISHED

Authentication Bypass Leading to Server-Side Command Execution

Assigner: MON-CSIRT
Reserved: 12.08.2026 Published: 23.10.2026 Updated: 23.10.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	onPhase
Product	onPhase Forms
Versions	Default: unaffected Version 11.0.14 is affected

Solutions

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.

Credits

an1msh finder
Crelic finder
dwbzn finder

References

Problem Types

CWE-306 Missing authentication for critical function CWE

Impacts

CAPEC-115 Authentication Bypass