CVE-2026-2526 is a command injection vulnerability identified in the Wavlink WL-WN579A3 wireless router firmware up to version 20210219. The vulnerability resides in the multi_ssid function implemented in the /cgi-bin/wireless.cgi script. Specifically, the argument SSID2G2 can be manipulated by an attacker to inject arbitrary shell commands. This occurs because the input is not properly sanitized before being passed to system-level commands, allowing remote attackers to execute arbitrary commands with the privileges of the web server process. The attack vector is network-based and does not require authentication or user interaction, increasing the risk of exploitation. The vendor was contacted early but has not issued any patch or mitigation guidance. The CVSS 4.0 score of 5.3 reflects a medium severity, with network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), no user interaction (UI:N), and partial impacts on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). Although no known exploits have been observed in the wild, the public disclosure of the vulnerability and proof-of-concept details increase the likelihood of future exploitation. The vulnerability could allow attackers to gain control over the device, pivot into internal networks, intercept or manipulate traffic, or disrupt network availability.

For European organizations, exploitation of CVE-2026-2526 could lead to unauthorized remote command execution on affected Wavlink WL-WN579A3 devices. This may result in compromise of network infrastructure, leading to data breaches, interception of sensitive communications, or disruption of network services. Organizations relying on these routers for critical connectivity, especially in small to medium enterprises or branch offices, could face operational downtime and reputational damage. The partial impact on confidentiality, integrity, and availability means attackers could exfiltrate data, alter configurations, or cause denial of service. The lack of vendor response and patch availability increases exposure time. Additionally, attackers could use compromised devices as footholds for lateral movement within corporate networks, escalating the overall risk posture. The threat is particularly relevant for sectors with high reliance on secure network infrastructure such as finance, healthcare, and government agencies within Europe.

Given the absence of an official patch from Wavlink, European organizations should implement the following specific mitigations: 1) Immediately isolate or remove affected WL-WN579A3 devices from critical network segments to limit exposure. 2) Employ network-level access controls such as firewall rules to restrict access to the router's management interfaces, especially blocking inbound connections to /cgi-bin/wireless.cgi. 3) Monitor network traffic for unusual requests targeting the SSID2G2 parameter or suspicious command execution patterns. 4) Where possible, replace affected devices with routers from vendors that provide timely security updates and have a strong security track record. 5) If device replacement is not feasible, consider deploying network segmentation and intrusion detection/prevention systems to detect and block exploitation attempts. 6) Maintain up-to-date asset inventories to identify all affected devices and prioritize remediation efforts. 7) Educate IT staff about this vulnerability and ensure incident response plans include steps for command injection incidents. 8) Regularly review and harden router configurations, disabling unnecessary services and interfaces to reduce attack surface.