CVE-2026-6026
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 Totolink A7100RU 7.4cu.2313_b20191024. This vulnerability affects the function setPortalConfWeChat of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument enable results in os command injection. The attack can be initiated remotely. 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 · high confidenceOS command injection vulnerability in Totolink A7100RU router firmware 7.4cu.2313_b20191024. The setPortalConfWeChat function in /cgi-bin/cstecgi.cgi does not properly sanitize the 'enable' parameter before passing it to system shell commands, allowing remote attackers to execute arbitrary OS commands.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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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Confirm device model is Totolink A7100RUAccess router administration interface or check device label/marketing materials to verify the exact model numberAffected if Device is not a Totolink A7100RU router, then this specific CVE does not apply
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Check installed firmware versionLog into router web interface, navigate to System or Status section to view firmware version; or use telnet/ssh to access device and run 'cat /proc/version' or 'version' commandAffected if Firmware version matches or predates 7.4cu.2313_b20191024 (older versions may also be affected)
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Verify WeChat portal feature is enabledIn router web interface, locate WeChat portal or Captive Portal settings under Wireless or Networking sections and check if feature is turned onAffected if WeChat portal feature is enabled - this is the attack surface required for command injection
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Confirm CGI endpoint is network-accessibleAttempt to reach http://router-ip/cgi-bin/cstecgi.cgi from internal network; check router firewall settings for CGI endpoint exposureAffected if CGI endpoint is accessible from network - combined with enabled WeChat portal, this indicates exploitable condition
User is affected if device is Totolink A7100RU with firmware 7.4cu.2313_b20191024 or earlier AND WeChat portal feature is enabled, making the command injection vulnerability reachable.
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 patch when available; until then, disable the WeChat portal feature via device administration, implement network access controls to restrict CGI endpoint exposure, and consider network segmentation to limit attack surface.
- Consultation6.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-6026 — 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-2026-6026 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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