Authentication Bypass Leading to Server-Side Command Execution
Summary
| CVE | CVE-2026-19677 |
|---|---|
| State | PUBLISHED |
| Assigner | MON-CSIRT |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-23 02:16:57 UTC |
| Updated | 2026-10-23 02:16:57 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v4.0 9.3 CRITICAL from 9c1820ae-fb77-4810-a8aa-ca46e7474d2f
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Problem Types: CWE-306 | CWE-306 CWE-306 Missing authentication for critical function
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | 9c1820ae-fb77-4810-a8aa-ca46e7474d2f | Secondary | 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:N/E:X/C... |
| 4.0 | CNA | CVSS | 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:N |
CVSS v4.0 Breakdown
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | OnPhase | OnPhase Forms | affected 11.0.14 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| frevvo-docs.atlassian.net/wiki/spaces/frevvo110/overview | 9c1820ae-fb77-4810-a8aa-ca46e7474d2f | frevvo-docs.atlassian.net | |
| frevvo-docs.atlassian.net/wiki/spaces/frevvo110/pages/1069273270/Detailed+Release+Notes | 9c1820ae-fb77-4810-a8aa-ca46e7474d2f | frevvo-docs.atlassian.net | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: an1msh (en)
CNA: Crelic (en)
CNA: dwbzn (en)
Additional Advisory Data
Solutions
CNA: * 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.