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CVE-2026-11523 Tenda CVE debrief

A stack-based buffer overflow vulnerability has been discovered in Tenda W20E version 15.11.0.6. The issue affects the `formPortalAuth` function located in the `/goform/PortalAuth` file of the Web Management Interface. An attacker can exploit this vulnerability remotely by manipulating the `gotoUrl` argument, leading to a potential stack-based buffer overflow. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 7.4, indicating a HIGH severity level. The vulnerability was published on [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-11523) and additional details can be found on [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-11523).

Vendor
Tenda
Product
W20E
CVSS
HIGH 7.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-07-23
Advisory published
2026-06-08
Advisory updated
2026-07-23

Who should care

Administrators and users of Tenda W20E version 15.11.0.6 should be aware of this vulnerability and take necessary precautions to mitigate the risk.

Technical summary

The vulnerability is caused by a stack-based buffer overflow in the `formPortalAuth` function of the `/goform/PortalAuth` file. This can be exploited remotely by an attacker manipulating the `gotoUrl` argument.

Defensive priority

HIGH

Recommended defensive actions

  • Update to the latest version of Tenda W20E if available.
  • Restrict access to the Web Management Interface.
  • Monitor network traffic for suspicious activity.

Evidence notes

The vulnerability has been published and an exploit may be available. See [ref-4](https://github.com/Robots10/IoT_vlu/blob/main/reports/Tenda/formPortalAuth/formPortalAuth.md) for more information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11523 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11523

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-11523 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11523

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.