CVE-2026-19677 onPhase CVE debrief

Who should care

Defenders responsible for frevvo installations, especially those exposed to the internet or untrusted networks, should assess exposure and prioritize remediation. This includes reviewing system logs for suspicious activity, implementing additional authentication and authorization controls, and tracking exceptions and remediated assets. Security teams and vulnerability management teams should also review the official CVE record and NVD entry for guidance on

Why it matters

CVE-2026-19677 is a critical authentication bypass vulnerability in frevvo version 11.0.14 that allows unauthenticated remote attackers to authenticate as arbitrary tenant users, gain TenantAdmin and Designer privileges, and execute operating system commands. Defenders responsible for frevvo installations should assess exposure and prioritize remediation due to the risk of potential operating system command execution, privilege elevation, and unauthorized access. The vulnerability requires verification of affected versions, exploitation, and remediation from official sources.

• Potential for arbitrary operating system command execution
• Possible elevation of privileges to TenantAdmin and Designer
• Risk of unauthorized access to sensitive data or systems
• Need for immediate remediation or compensating controls

Technical summary

The vulnerability exists in the public onPhase/ frevvo registration form version 11.0.14, allowing 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. This vulnerability is considered critical due to the potential for operating system command execution and privilege elevation. Defenders should focus on verifying affected systems, reviewing official advisories, and implementing compensating controls.

Defensive priority

High priority remediation is recommended for systems using frevvo version 11.0.14, especially those exposed to the internet or untrusted networks.

Recommended defensive actions

• Immediately review and upgrade to a patched version of frevvo if available
• Restrict access to the frevvo registration form to trusted networks or users
• Monitor system logs for suspicious activity related to frevvo
• Implement additional authentication and authorization controls for tenant users
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected systems, exploitation, or remediation is limited. There is no evidence of public exploitation or specific vendor guidance beyond upgrading to a patched version. Defenders should verify affected systems, review official advisories, and monitor for suspicious activity related to frevvo. The CVE Program and NVD entries are considered authoritative sources for this vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.