CVE-2026-34809
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 · uneditedEndian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /cgi-bin/zonefw.cgi. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.
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 confidenceEndian Firewall version 3.3.25 and prior contains a stored cross-site scripting (XSS) vulnerability in the web interface. The remark parameter in /cgi-bin/zonefw.cgi does not properly sanitize user input, allowing an authenticated attacker to inject malicious JavaScript that is persistently stored and executed when other users access the affected page.
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<= 3.3.25CVSS 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 Endian Firewall versionCheck the installed version by viewing /etc/redhat-release, /etc/ endian-version, or running 'Endian-Version' command if available. Alternatively, check the web interface login page footer or about section for version display.Affected if Version is 3.3.25 or lower (any version <= 3.3.25)
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Confirm web interface is accessibleVerify the Endian Firewall web management interface is reachable by accessing the hostname/IP on ports 80/443. The vulnerability requires the web interface to be enabled.Affected if Web interface is enabled and accessible on the network
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Verify zonefw.cgi existsCheck if /cgi-bin/zonefw.cgi exists on the web server by attempting to access it directly via browser or command line (curl/GET). This is the affected CGI script.Affected if The zonefw.cgi script is present and accessible at /cgi-bin/zonefw.cgi
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Identify remark parameter exposureInspect the forms and parameters submitted to zonefw.cgi. Look for any input fields named 'remark' or similar. Review the application's HTML source or form definitions to locate the vulnerable parameter.Affected if The application accepts a 'remark' or similar text input parameter in zonefw.cgi without proper sanitization
A user is affected if they are running Endian Firewall Community version 3.3.25 or lower with the web interface enabled and the zonefw.cgi script accessible, which accepts an unsanitized 'remark' parameter.
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 proper input validation and output encoding for the remark parameter in zonefw.cgi. All user-supplied content should be sanitized before storage and HTML-escaped before rendering in the browser.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-34809 — 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-2026-34809 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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- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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