CVE-2026-86300Public exploitNetwork attack vector

Administrator takeover via auth-exempt password reset

Published Sep 7, 2026 · Updated Sep 8, 2026

Improper authentication in Tenda AC9 15.03.05.14 Web Management allows remote attackers to replace the administrator password. R7WebsSecurityHandler exempts the /goform/fast_setting prefix from authentication, after which the endpoint writes loginPwd to sys.userpass and commits it to flash. No credentials or user interaction are required; a successful request replaces the stored password and grants full router administration.

CVSS severityUnavailable
Unscored
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Tenda AC9 15.03.05.14 Web Management allows remote attackers to replace the administrator password. R7WebsSecurityHandler exempts the /goform/fast_setting prefix from authentication, after which the endpoint writes loginPwd to sys.userpass and commits it to flash. No credentials or user interaction are required; a successful request replaces the stored password and grants full router administration.

The record

CVE
CVE-2026-86300
Published
Sep 7, 2026
Updated
Sep 8, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC9
Classifications
CWE-287, T1098, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15.03.05.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC9version=15.03.05.14

Published CVSS scores

7.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
6.9VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.5VulDB CNAAV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
7.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1098Account Manipulation
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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