CVE-2026-5526
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA security flaw has been discovered in Tenda 4G03 Pro up to 1.0/1.1/04.03.01.53/192.168.0.1. Affected by this vulnerability is an unknown functionality of the file /bin/httpd. The manipulation results in improper access controls. The attack may be performed from remote. The exploit has been released to the public and may be used for attacks.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceTenda 4G03 Pro routers contain an improper access control vulnerability in the /bin/httpd web server binary. The vulnerability allows remote attackers to bypass authentication mechanisms, and the CVSS 9.8 indicates trivial network exploitation without authentication leads to full system compromise. A public exploit exists, increasing immediate risk.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 04.03.01.53CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check the installed firmware versionAccess the router's web administration interface (typically at 192.168.0.1 or 192.168.1.1) and navigate to System Settings > Firmware Version, or log into the device via telnet/ssh and run: cat /proc/version or cat /etc/os-releaseAffected if The firmware version displayed is exactly 04.03.01.53
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Verify the httpd binary existsIf you have telnet/ssh access to the router, run: ls -la /bin/httpdAffected if The file /bin/httpd exists on the device filesystem
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Confirm the web management interface is accessibleAttempt to access the router's login page via HTTP (typically port 80) from both LAN and WAN IP addressesAffected if The HTTP login page is reachable and accepts requests
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Check if remote WAN management is enabledIn the router's web UI, go to System Settings > Remote Management or similar, and verify whether remote (WAN) access to the HTTP admin interface is permittedAffected if Remote administration is enabled, allowing the HTTP interface to be accessed from outside the local network
You are affected if the router runs firmware version 04.03.01.53 AND the web management interface is accessible, especially if remote WAN access is enabled.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply vendor firmware updates if available; if no patch exists, restrict router web interface to trusted networks only and monitor for exploitation attempts. Consider router replacement if vendor support is unavailable.
- Consultation4.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-5526 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-5526 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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