CVE-2026-6792: FlexCity Auth Bypass Vulnerability

CVE-2026-6792 Overview

CVE-2026-6792 is a Missing Authorization vulnerability [CWE-862] in Universal Software Inc.'s FlexCity product. The flaw stems from incorrectly configured access control security levels. Authenticated attackers with low privileges can exploit this weakness over the network to access resources beyond their permission boundary.

The issue affects FlexCity versions 5.536.0 through 11052026. The vulnerability was disclosed through Türkiye's national cyber security notification TR-26-0593.

Critical Impact
An authenticated attacker with low privileges can access confidential information within FlexCity by bypassing access control checks, leading to unauthorized disclosure of sensitive data.

Affected Products

Universal Software Inc. FlexCity version 5.536.0
Universal Software Inc. FlexCity versions between 5.536.0 and 11052026
Universal Software Inc. FlexCity version 11052026

Discovery Timeline

2026-07-21 - CVE-2026-6792 published to NVD
2026-07-21 - Last updated in NVD database

Technical Details for CVE-2026-6792

Vulnerability Analysis

CVE-2026-6792 is a Missing Authorization weakness classified under [CWE-862]. FlexCity performs an action or exposes a resource without verifying that the requesting user holds the necessary permission. The authorization layer either fails to execute or applies incorrectly configured security levels to sensitive functions.

An attacker authenticated to FlexCity with low-privilege credentials can issue network requests that access data or functionality reserved for higher-privileged roles. The issue impacts confidentiality of protected records. Integrity and availability remain unaffected based on the published impact metrics.

The vulnerability affects a wide version range, from 5.536.0 through build 11052026, suggesting the flawed authorization logic persisted across multiple releases.

Root Cause

The root cause is an access control implementation that fails to enforce authorization checks on protected functions or resources. Security levels are assigned or evaluated incorrectly, so the application treats low-privilege sessions as authorized for actions that should require elevated permissions. Missing server-side authorization enforcement is the underlying defect.

Attack Vector

Exploitation occurs over the network and requires valid low-privilege credentials. No user interaction is needed. An attacker authenticates to FlexCity, then sends crafted requests to endpoints or functions that fail to validate the caller's role. The server returns confidential data that should be restricted to privileged users.

The vulnerability manifests when server-side handlers omit authorization checks or rely on client-supplied identifiers to determine access. See the Siber Güvenlik Notification TR-26-0593 for further technical details.

Detection Methods for CVE-2026-6792

Indicators of Compromise

Repeated FlexCity API or web requests from a single authenticated session to endpoints outside the user's normal role scope.
HTTP 200 responses returning sensitive records to accounts that historically only accessed low-sensitivity data.
Sequential enumeration of object identifiers or record IDs from a single low-privileged account.
Anomalous access patterns from service accounts or read-only users to administrative or restricted endpoints.

Detection Strategies

Baseline each FlexCity user role's typical endpoint access and alert on deviations to restricted routes.
Correlate authentication events with subsequent authorization decisions to identify sessions accessing data above their role scope.
Deploy application-layer logging that records the requesting principal, target resource, and authorization outcome for every FlexCity request.
Ingest FlexCity access logs into Singularity Data Lake for OCSF-normalized queries and long-retention analytics across identity and application telemetry.

Monitoring Recommendations

Monitor FlexCity access logs for unusual data export volumes tied to low-privilege accounts.
Track failed-to-successful request ratios per account to detect enumeration attempts against protected endpoints.
Alert on any account accessing sensitive records outside standard business hours or from atypical source addresses.

How to Mitigate CVE-2026-6792

Immediate Actions Required

Upgrade FlexCity to a release later than build 11052026 once Universal Software Inc. publishes a fixed version.
Audit all FlexCity user accounts and revoke unnecessary low-privilege access to reduce the population of potential exploiters.
Rotate credentials for accounts that may have been used to access data beyond their authorization scope.
Review FlexCity access logs for the disclosure window to identify unauthorized reads of confidential data.

Patch Information

Universal Software Inc. has not published a fixed version in the referenced advisory at time of NVD publication. Refer to the Siber Güvenlik Notification TR-26-0593 and contact Universal Software Inc. directly for remediation guidance and patch availability.

Workarounds

Restrict network reachability to the FlexCity application to trusted networks or via VPN until a patched version is available.
Enforce the principle of least privilege for all FlexCity accounts and remove any role assignments that are not strictly required.
Add a reverse proxy or web application firewall in front of FlexCity to log and constrain access to sensitive endpoints.
Enable multi-factor authentication for all FlexCity users to raise the cost of credential abuse.

bash

# Example: restrict FlexCity access at the network edge with iptables
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP