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CVE-2026-90689: Tenda W20E formDelWebAuthWhiteUser stack-based overflow

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-14
• Weakness: CWE-119

Description

A security flaw has been discovered in Tenda W20E 15.11.0.61068_1546_841_CN_TDC. Impacted is the function formDelWebAuthWhiteUser. Performing a manipulation of the argument webAuthWhiteUserIndex results in stack-based buffer overflow. The attack can be initiated remotely.

Affected products

• Tenda W20E: 15.11.0.61068_1546_841_CN_TDC

References

• https://github.com/Amalll-Sec/router-vulnerability-research/blob/main/advisories/Tenda/W20E/formDelWebAuthWhiteUser/README.md
• https://vuldb.com/cve/CVE-2026-90689
• https://vuldb.com/submit/914981
• https://vuldb.com/vuln/403222
• https://vuldb.com/vuln/403222/cti
• https://www.tenda.com.cn/

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