CVE-2026-19677: CWE-306 Missing authentication for critical function in onPhase onPhase Forms
Description
CVE-2026-19677 is a critical authentication bypass vulnerability in onPhase Forms version 11.0.14. It allows unauthenticated remote attackers to impersonate arbitrary tenant users, escalate privileges to TenantAdmin and Designer roles, and execute arbitrary operating system commands by manipulating registration parameters with valid tenant and user identifiers.
CVSS v4.0
Score 9.3critical
Affected software
onPhase
onPhase Forms
pkg:github/onphase/onPhase-FormsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-306) in onPhase Forms 11.0.14 arises from missing authentication checks in the public onPhase/frevvo registration form. An attacker can bypass authentication mechanisms by crafting registration parameters containing a valid tenant name and an existing user identifier, thereby gaining unauthorized access with elevated privileges and the ability to execute arbitrary OS commands.
Potential Impact
Successful exploitation grants unauthenticated attackers TenantAdmin and Designer privileges, enabling full administrative control over the tenant environment and the capability to execute arbitrary operating system commands, which could lead to complete system compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the affected registration form and monitor for suspicious activity related to tenant registration parameters.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- MON-CSIRT
- Date Reserved
- 2026-08-12T22:38:37.258Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6adabc564d27ba8daa9ac517
Added to database: 10/23/2026, 01:45:58 UTC
Last enriched: 10/23/2026, 02:00:22 UTC
Last updated: 10/23/2026, 02:00:52 UTC
Views: 7
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