CVE-2026-4767: WAF-ASP Authentication Bypass Vulnerability

CVE-2026-4767 Overview

CVE-2026-4767 is a missing authentication vulnerability [CWE-306] in TR7 Cyber Defense Inc. WAF-ASP, a Web Application Firewall product. The flaw allows unauthenticated attackers to abuse authentication controls over the network without user interaction. Affected versions span from v1.0.324.900 up to (but not including) v1.4.0.117. Because the vulnerability sits in a security appliance intended to protect downstream web applications, successful exploitation undermines the trust boundary the WAF is deployed to enforce.

Critical Impact
Unauthenticated network attackers can abuse authentication on the WAF-ASP appliance, potentially bypassing controls, altering policies, or accessing protected functions.

Affected Products

TR7 Cyber Defense Inc. WAF-ASP v1.0.324.900 through versions prior to v1.4.0.117
Web applications protected behind vulnerable WAF-ASP deployments
Administrative and policy-management interfaces exposed by WAF-ASP

Discovery Timeline

2026-07-02 - CVE-2026-4767 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-4767

Vulnerability Analysis

The vulnerability is classified under [CWE-306]: Missing Authentication for a Critical Function. WAF-ASP exposes one or more critical functions that do not verify the caller's identity before executing privileged actions. An attacker reaching the appliance over the network can invoke these functions directly, resulting in Authentication Abuse as described by the vendor advisory.

Because WAF-ASP mediates traffic to protected web applications, abusing its authentication surface can enable an adversary to weaken policy enforcement, exfiltrate configuration, or pivot deeper into the environment. The vulnerability requires no prior credentials and no user interaction, and it impacts confidentiality, integrity, and availability of the appliance.

Root Cause

The root cause is the absence of an authentication check on a function that performs security-sensitive operations. In line with [CWE-306], the affected code path assumes the caller is authorized without validating a session, token, or credential. Any client capable of reaching the exposed endpoint on the network is treated as trusted.

Attack Vector

Exploitation occurs over the network against the WAF-ASP management or service interface. An attacker sends a crafted request directly to the vulnerable function. Because no authentication is enforced, the appliance processes the request as if it originated from a legitimate operator. No specific technical proof-of-concept has been published; refer to the Siber Guvenlik Security Advisory for vendor-supplied details.

Detection Methods for CVE-2026-4767

Indicators of Compromise

Unexpected administrative or policy-change events on WAF-ASP appliances without a corresponding authenticated session.
Inbound requests to WAF-ASP management endpoints from IP addresses outside approved administrative ranges.
Modifications to WAF rules, allow-lists, or logging configuration that do not map to change-management tickets.
Sudden gaps or disabling of logging on the WAF that coincide with anomalous management-plane traffic.

Detection Strategies

Enable verbose audit logging on WAF-ASP and forward events to a centralized SIEM or data lake for correlation.
Baseline normal administrative activity on the appliance and alert on requests to sensitive endpoints that lack a preceding authentication event.
Correlate WAF policy changes with identity provider logs to confirm each change originated from an authenticated administrator.
Use network telemetry to identify direct access to the WAF management interface from non-jumpbox sources.

Monitoring Recommendations

Ingest WAF-ASP logs into a centralized analytics platform such as Singularity Data Lake for cross-source correlation.
Monitor management-plane traffic with allow-listed source enforcement and alert on deviations.
Track appliance firmware and version strings to identify hosts still running versions before v1.4.0.117.
Review outbound connections from the WAF for signs of configuration exfiltration or command-and-control.

How to Mitigate CVE-2026-4767

Immediate Actions Required

Upgrade WAF-ASP to version v1.4.0.117 or later on all affected appliances.
Restrict access to the WAF management interface to a dedicated administrative network segment.
Rotate any credentials, API keys, or certificates configured on the appliance if compromise is suspected.
Review WAF policy history for unauthorized modifications since the vulnerable version was first deployed.

Patch Information

The vendor addresses CVE-2026-4767 in WAF-ASP v1.4.0.117. Deployments running any version from v1.0.324.900 up to (but not including) v1.4.0.117 are affected and must be upgraded. Consult the Siber Guvenlik Security Advisory for vendor-published upgrade guidance.

Workarounds

Place the WAF-ASP management interface behind a VPN or bastion host to eliminate direct network exposure.
Apply strict firewall rules that permit management traffic only from named administrator workstations.
Enable multi-factor authentication on any upstream access path such as VPN or jumpbox until patching is complete.
Increase log retention and alerting on the appliance to shorten identification time for authentication-abuse attempts.

bash

# Example: restrict WAF-ASP management interface to an admin subnet
# Adjust interface, port, and CIDR to match your deployment
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP