CVE-2026-24437 identifies a vulnerability in the Shenzhen Tenda Technology Co., Ltd. W30E V2 router firmware versions up to and including V16.01.0.19(5037). The root cause is the absence of appropriate cache-control directives in HTTP responses serving sensitive administrative content. Specifically, the router's web interface delivers credential-bearing pages without headers such as 'Cache-Control: no-store' or 'Pragma: no-cache', which instruct browsers not to store sensitive data. As a result, browsers cache these responses locally on the client machine. This cached data can include administrative credentials or session tokens, which, if accessed by unauthorized users with local access to the client device, can lead to credential compromise. The vulnerability requires an attacker to have local access to the client machine or device where the browser cache resides, and the attacker needs only low privileges; no user interaction is necessary. The CVSS 4.0 vector indicates local attack vector (AV:L), low attack complexity (AC:L), no privileges required (PR:L), no user interaction (UI:N), and low impact on confidentiality (VC:L), with no impact on integrity or availability. No known exploits are currently in the wild, and no patches have been released by the vendor at the time of publication. The vulnerability primarily threatens confidentiality by exposing sensitive credentials through cached browser data, which can be leveraged for further unauthorized administrative access to the router. This issue is categorized under CWE-525, which concerns the use of web browser cache containing sensitive information.

For European organizations, especially small and medium enterprises (SMEs) and home office environments that deploy Shenzhen Tenda W30E V2 routers, this vulnerability poses a confidentiality risk. If multiple users share client devices or if endpoint security is insufficient, cached administrative credentials could be accessed by unauthorized personnel, potentially leading to unauthorized configuration changes or network compromise. While the vulnerability does not directly affect network availability or integrity, unauthorized administrative access could facilitate further attacks such as network traffic interception, malware deployment, or lateral movement within the network. The risk is heightened in environments where physical or local access controls are weak, such as shared workspaces or remote work setups. Since the vulnerability requires local access to the client device's browser cache, remote exploitation is unlikely, limiting the scope of impact. However, in high-security environments or critical infrastructure sectors, even local credential exposure can have significant consequences. The lack of a patch increases the window of exposure, necessitating interim mitigations.

To mitigate CVE-2026-24437, organizations should implement several specific measures beyond generic advice. First, restrict physical and local access to client devices that access the router's administrative interface to trusted personnel only. Enforce strict endpoint security policies, including regular clearing of browser caches and disabling caching of sensitive web content where possible. Use browsers or browser extensions that can enforce cache-control policies or private browsing modes when accessing router interfaces. Network administrators should monitor for unusual administrative access patterns and consider changing default or known credentials regularly. Where feasible, segment management interfaces from general user networks to reduce exposure. Organizations should actively track Shenzhen Tenda's firmware updates and apply patches promptly once available. Additionally, consider deploying alternative routers with better security postures if the risk is unacceptable. Educate users about the risks of shared devices and the importance of logging out and clearing caches after administrative sessions.