CVE-2026-27512
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 · uneditedShenzhen Tenda F3 Wireless Router firmware V12.01.01.55_multi contains a content-type confusion vulnerability in the administrative interface. Responses omit the X-Content-Type-Options: nosniff header and include attacker-influenced content that can be reflected into the response body. Under affected browser behaviors, MIME sniffing may cause the response to be interpreted as active HTML, enabling script execution in the context of the administrative interface.
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 confidenceThe Tenda F3 router firmware V12.01.01.55_multi administrative interface fails to include the X-Content-Type-Options: nosniff header in HTTP responses. This allows browsers to perform MIME sniffing and interpret reflected attacker-controlled content as active HTML, enabling script execution in the administrative context. This is a reflected XSS enabled by missing content-type security headers.
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<= 12.01.01.55_multiCVSS 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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/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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Confirm Tenda F3 router modelAccess the router admin interface or check the device label/marketing to confirm the model is Tenda F3Affected if The device is not a Tenda F3 router
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Check firmware versionLog into the router administrative interface and navigate to System Status or Firmware Upgrade page to view the installed firmware versionAffected if Firmware version is 12.01.01.55_multi or any version lower than this (in the <= 12.01.01.55_multi range)
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Verify admin interface accessibilityAccess the router web interface on the default IP (typically 192.168.0.1 or 192.168.1.1) using HTTP or HTTPSAffected if Administrative interface is not reachable for testing
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Test for missing X-Content-Type-Options headerUse a browser developer tool or command-line tool (curl -I) to capture HTTP response headers from any administrative page (such as the login page or status page) and inspect whether the X-Content-Type-Options header is presentAffected if The X-Content-Type-Options: nosniff header is absent from HTTP responses
A Tenda F3 router running firmware version 12.01.01.55_multi or lower AND whose administrative interface responses lack the X-Content-Type-Options header is affected by this vulnerability.
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 dataAdd X-Content-Type-Options: nosniff header to all administrative interface responses and implement proper input validation and output encoding to prevent script injection via reflected content.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-27512 — 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-2026-27512 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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