CVE-2026-11523: Tenda W20E Web Management PortalAuth formPortalAuth stack-based overflow

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-08 · updated 2026-07-23
Weakness: CWE-119

Description

A flaw has been found in Tenda W20E 15.11.0.6. This issue affects the function formPortalAuth of the file /goform/PortalAuth of the component Web Management Interface. Executing a manipulation of the argument gotoUrl can lead to stack-based buffer overflow. The attack can be launched remotely. The exploit has been published and may be used.

Affected products

Tenda W20E: 15.11.0.6

References

https://github.com/Robots10/IoT_vlu/blob/main/reports/Tenda/formPortalAuth/formPortalAuth.md
https://vuldb.com/cve/CVE-2026-11523
https://vuldb.com/submit/836471
https://vuldb.com/vuln/369143
https://vuldb.com/vuln/369143/cti
https://www.tenda.com.cn/
https://github.com/Robots10/IoT_vlu/blob/main/reports/Tenda/formPortalAuth/formPortalAuth.md

Get alerted when CVE-2026-11523 or the next vulnerability affects your stack