CVE-2023-51726
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 · uneditedThis vulnerability exist in Skyworth Router CM5100, version 4.1.1.24, due to insufficient validation of user supplied input for the SMTP Server Name parameter at its web interface. A remote attacker could exploit this vulnerability by supplying specially crafted input to the parameter at the web interface of the vulnerable targeted system. Successful exploitation of this vulnerability could allow the attacker to perform stored XSS attacks on the targeted system.
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 confidenceStored XSS vulnerability in Skyworth Router CM5100 (v4.1.1.24) web interface. The SMTP Server Name parameter lacks proper input validation, allowing malicious scripts to be injected and persisted.
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= 4.1.1.24CVSS 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
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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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Identify device model and firmware versionAccess the router web interface or check the administration page for device information. Look for 'CM5100' in the model name and '4.1.1.24' in the firmware version field.Affected if The device is a Skyworth CM5100 and the firmware version is exactly 4.1.1.24
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Locate SMTP configuration in the web interfaceNavigate to the router web interface and find the email/SMTP settings section. This is typically under 'Advanced Settings', 'Network Settings', or 'Administration' menus.Affected if SMTP configuration menu exists and is accessible in the web interface
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Check if SMTP Server Name field is presentIn the SMTP settings section, identify the input field for 'SMTP Server' or 'SMTP Server Name' where the mail server address is configured.Affected if The SMTP Server Name input field exists and accepts user-supplied values
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Verify web interface is accessible without authentication bypassConfirm that the router web interface login is functional and you can access the SMTP configuration area with proper admin credentials.Affected if The web interface is accessible and SMTP settings can be viewed or modified by an authenticated user
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Inspect current SMTP Server Name value for special charactersExamine the current value stored in the SMTP Server Name field. Look for any HTML or script tags like <script>, javascript:, or other suspicious characters that may indicate stored XSS.Affected if The SMTP Server Name field contains or allows storage of HTML/script tags without sanitization
You are affected if you have a Skyworth CM5100 router running firmware version 4.1.1.24 with an accessible web interface that contains an SMTP Server Name configuration field.
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 dataImplement strict input validation and output encoding for the SMTP Server Name parameter. Restrict web interface access to trusted users until vendor patch is applied.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-51726 — 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-2023-51726 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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