CVE-2026-30140
Published: 09 March 2026
Summary
CVE-2026-30140 is a high-severity Improper Access Control (CWE-284) vulnerability in Tenda W15E Firmware. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 20.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-14 (Permitted Actions Without Identification or Authentication) and AC-3 (Access Enforcement).
Deeper analysis
CVE-2026-30140 is an incorrect access control vulnerability (CWE-284) in the Tenda W15E router running firmware version V02.03.01.26_cn. Published on 2026-03-09T19:16:07.303, it carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). The flaw enables an unauthenticated attacker to access the /cgi-bin/DownloadCfg/RouterCfm.jpg endpoint, which serves a configuration file containing plaintext administrator credentials.
Any unauthenticated attacker with network access to the affected router can exploit this vulnerability with low complexity and no user interaction required. Exploitation allows downloading the configuration file, resulting in high-impact sensitive information disclosure, including administrator credentials. This disclosure could facilitate subsequent remote administrative access to the device.
Details on mitigation, including any patches or workarounds, are documented in the advisory at https://github.com/jhx-ui/CVE-Reports/blob/main/README.md#vulnerability-report-tenda-router-sensitive-information-disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-10346
Vulnerability details
An incorrect access control vulnerability exists in Tenda W15E V02.03.01.26_cn. An unauthenticated attacker can access the /cgi-bin/DownloadCfg/RouterCfm.jpg endpoint to download the configuration file containing plaintext administrator credentials, leading to sensitive information disclosure and potential remote administrative access.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Vulnerability is an unauthenticated remote access control flaw in a router web endpoint that directly exposes a config file containing plaintext admin credentials; maps to T1190 for exploitation of the public-facing application and T1552.001 for retrieval of unsecured credentials stored in files.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Enforces approved access authorizations to block unauthenticated access to the sensitive configuration download endpoint.
Limits permitted actions without identification or authentication, explicitly prohibiting download of configuration files containing plaintext credentials.
Provides protections for publicly accessible router interfaces against unauthorized disclosure of sensitive configuration data.