CVE-2026-20742
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 · uneditedAn OS command injection vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an authenticated attacker to achieve remote code execution on the system by injecting malicious input into requests sent to the templates route.
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 confidenceAn OS command injection vulnerability in XWEB Pro version 1.12.1 and prior allows authenticated attackers to execute arbitrary OS commands by injecting malicious input into the templates route, achieving remote code execution on the affected system.
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<= 1.12.1<= 1.12.1<= 1.12.1CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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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Identify the installed Xweb firmware versionAccess the device web interface and navigate to System Information or Settings > About page, or check the firmware version via the administrative console or SNMP if availableAffected if The firmware version is 1.12.1 or any version lower than 1.12.1 for Xweb 300d Pro, Xweb 500d Pro, or Xweb 500b Pro models
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Confirm the templates route is accessibleAttempt to access the templates endpoint via HTTP/HTTPS request to the web interface (commonly at /templates or a similar path used for template management)Affected if The templates route responds and accepts user input without returning an access denied or authentication required error
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Verify if authentication is required for the web interfaceCheck the web server configuration or attempt to access protected areas of the Xweb interface without credentialsAffected if Authentication is disabled, weak, or the templates route is accessible without valid credentials despite the vulnerability description mentioning authentication requirement
A user is affected if their Copeland Xweb device runs firmware version 1.12.1 or earlier AND the templates route is exposed and accessible, regardless of authentication status since the check cannot fully validate the auth requirement.
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 input validation and sanitization on all user-supplied data in the templates route, and replace unsafe command execution methods with parameterized commands or safe API alternatives; upgrade to a patched version if available from the vendor.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 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 $3,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-20742 — 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-2026-20742 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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