CVE-2026-30140 is classified as a high-severity vulnerability affecting the Tenda W15E firmware version V02.03.01.26_cn. This vulnerability allows an unauthenticated attacker to exploit an incorrect access control mechanism, gaining access to the /cgi-bin/DownloadCfg/RouterCfm.jpg endpoint. As a result, the attacker can download the configuration file that contains plaintext administrator credentials, leading to sensitive information disclosure and potential remote administrative access.
With a CVSS score of 7.5, this vulnerability presents a significant risk to organizations using the affected firmware version. The ease of exploitation, combined with the potential for unauthorized access to sensitive data, highlights the urgency of addressing this issue.
The vulnerability was published on March 9, 2026, and has been analyzed but does not currently have known exploits or public proof-of-concept available. However, organizations are advised to take this vulnerability seriously due to its high potential impact.
Organizations should prioritize patching immediately to protect against possible exploitation of this vulnerability.
Vulnerability Details
The vulnerability in question is characterized by incorrect access control, classified under CWE-284. It affects the Tenda W15E firmware, specifically version 02.03.01.26_cn. The CVSS 3.1 vector string for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, indicating a network attack vector with low complexity and no privileges required.
The high confidentiality impact signifies that sensitive data is at risk, while integrity and availability impacts are not affected. This vulnerability’s publication date is March 9, 2026.
Technical Analysis
The root cause of CVE-2026-30140 is an incorrect access control configuration that permits unauthenticated users to access sensitive configuration files on the device. The attack vector is primarily network-based, allowing an attacker to exploit this vulnerability without any need for local access or user interaction.
The requirements for exploitation are minimal, as no privileges are necessary, and user interaction is not required. The confidentiality impact is high, as the attacker can gain access to plaintext administrator credentials, while the integrity and availability of the system remain unaffected.
Risk & Impact Analysis
The real-world risk associated with this vulnerability is significant. Organizations deploying the Tenda W15E firmware without appropriate patches face the potential for unauthorized access to sensitive configuration data. The blast radius could extend to any networked device utilizing the compromised firmware, amplifying the risk across multiple systems.
Given the CVSS score of 7.5, organizations should address this vulnerability in their priority patch cycle. The urgency is heightened by the lack of known exploits, as attackers may quickly develop them if they recognize the vulnerability’s existence.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected product is the Tenda W15E firmware, specifically version 02.03.01.26_cn. Organizations using this version are vulnerable to the described access control issue. If version information is lacking, it is essential to state that all versions prior to vendor patch are affected.
Mitigation & Remediation
Organizations should prioritize patching immediately to secure the Tenda W15E firmware against this vulnerability. It is recommended to upgrade to the latest firmware version provided by Tenda. If a patch is not available, consider implementing configuration hardening measures to restrict access to sensitive endpoints.
In addition to patching, organizations should implement monitoring measures to detect unauthorized access attempts and review logs for any anomalies that may indicate exploitation attempts.
Penetration testing can also help validate the efficacy of the applied security measures.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for access to the /cgi-bin/DownloadCfg/RouterCfm.jpg endpoint. Any attempts to access sensitive configuration files should be flagged for immediate investigation.
Behavioral anomalies that deviate from normal access patterns could signify an active exploitation attempt. Network signatures related to unauthorized access should also be established.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-30140 lies in the increasing trend of vulnerabilities related to access control misconfigurations. Organizations must recognize the potential for such vulnerabilities to be exploited as attackers become more sophisticated.
Security teams should leverage insights from this incident to evaluate and enhance their access control mechanisms. Regular security assessments and updates to configuration management practices can help mitigate similar risks.
Vulnerability management programs should be designed to identify and address such vulnerabilities proactively.
Penetration testing methodologies can provide valuable insights into potential weaknesses, allowing organizations to strengthen their defenses.
Cloud security assessments can also play a critical role in identifying vulnerabilities within cloud-based configurations.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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