Unauthenticated root access via management endpoint bypass
Published Apr 4, 2026 · Updated Apr 4, 2026
Authentication bypass in Tenda 4G03 Pro 1.0, 1.1, and firmware through 04.03.01.53 allows remote attackers to access management endpoints. The R7WebsSecurityHandler function in httpd skips authentication for the telnet, ate, and zerotier handlers when the administrator password is empty. Factory-default configuration is sufficient to start a passwordless root Telnet service, expose VPN settings, or reach OS command injection.
Summary
What happened
Authentication bypass in Tenda 4G03 Pro 1.0, 1.1, and firmware through 04.03.01.53 allows remote attackers to access management endpoints. The R7WebsSecurityHandler function in httpd skips authentication for the telnet, ate, and zerotier handlers when the administrator password is empty. Factory-default configuration is sufficient to start a passwordless root Telnet service, expose VPN settings, or reach OS command injection.
The record
- CVE
- CVE-2026-5526
- Published
- Apr 4, 2026
- Updated
- Apr 4, 2026
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- 4G03 Pro
- Classifications
- CWE-266, CWE-284, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 4, 2026CVE publishedPublication date reported by the CVE source.
- Apr 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=04.03.01.0
- Affected versionversion=04.03.01.1
- Affected versionversion=04.03.01.10
- Affected versionversion=04.03.01.11
- Affected versionversion=04.03.01.12
- Affected versionversion=04.03.01.13
- Affected versionversion=04.03.01.14
- Affected versionversion=04.03.01.15
- Affected versionversion=04.03.01.16
- Affected versionversion=04.03.01.17
- Affected versionversion=04.03.01.18
- Affected versionversion=04.03.01.19
- Affected versionversion=04.03.01.2
- Affected versionversion=04.03.01.20
- Affected versionversion=04.03.01.21
- Affected versionversion=04.03.01.22
- Affected versionversion=04.03.01.23
- Affected versionversion=04.03.01.24
- Affected versionversion=04.03.01.25
- Affected versionversion=04.03.01.26
- Affected versionversion=04.03.01.27
- Affected versionversion=04.03.01.28
- Affected versionversion=04.03.01.29
- Affected versionversion=04.03.01.3
- Affected versionversion=04.03.01.30
- Affected versionversion=04.03.01.31
- Affected versionversion=04.03.01.32
- Affected versionversion=04.03.01.33
- Affected versionversion=04.03.01.34
- Affected versionversion=04.03.01.35
- Affected versionversion=04.03.01.36
- Affected versionversion=04.03.01.37
- Affected versionversion=04.03.01.38
- Affected versionversion=04.03.01.39
- Affected versionversion=04.03.01.4
- Affected versionversion=04.03.01.40
- Affected versionversion=04.03.01.41
- Affected versionversion=04.03.01.42
- Affected versionversion=04.03.01.43
- Affected versionversion=04.03.01.44
- Affected versionversion=04.03.01.45
- Affected versionversion=04.03.01.46
- Affected versionversion=04.03.01.47
- Affected versionversion=04.03.01.48
- Affected versionversion=04.03.01.49
- Affected versionversion=04.03.01.5
- Affected versionversion=04.03.01.50
- Affected versionversion=04.03.01.51
- Affected versionversion=04.03.01.52
- Affected versionversion=04.03.01.53
- Affected versionversion=04.03.01.6
- Affected versionversion=04.03.01.7
- Affected versionversion=04.03.01.8
- Affected versionversion=04.03.01.9
- Affected versionversion=1.0
- Affected versionversion=1.1
- Affected versionversion=192.168.0.0
- Affected versionversion=192.168.0.1
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- Unauthenticated management endpoint proof of conceptfunctional · demonstrated
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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