w3cub.com security report

Certificate, security headers, email authentication, DNS, registration, and exposed hosts — from public sources.

40risk

Moderate

Some surface to tighten, nothing urgent.

0Critical

0High

4Medium

3Low

2Info

Collected 10 hours ago32.0sfrom cache

Certificate Transparency19
DNS resolution20
Network ownership0
CDN / WAF detection0
Exposed ports & CVEs26
Registration
DNS posture2
Email authentication2
Certificate
Security headers0
Archived URLs
Analysis9

noteCertificate inspection is unavailable in this runtime.
noteNetwork ownership lookup is unavailable in this runtime; ASN and org are omitted.
noteCDN/WAF detection is unavailable in this runtime.
note2 hosts were identified as CDN/edge infrastructure from ASN ownership rather than a cdncheck fingerprint.

Without HSTS the browser will still try http:// first on a fresh visit, which is the window an on-path attacker uses.
What to do
Send `Strict-Transport-Security: max-age=31536000; includeSubDomains` once you are sure everything works over HTTPS.
asset: https://w3cub.com/
CSP is the main defence that limits what an injected script can do. Without it, any XSS bug is fully exploitable.
What to do
Start with a report-only policy, tighten it against the reports, then enforce.
asset: https://w3cub.com/
No X-Frame-Options or CSP frame-ancestors directive, so another site can load this page invisibly inside its own and trick users into clicking.
What to do
Send `X-Frame-Options: DENY` or `Content-Security-Policy: frame-ancestors ’none’`.
asset: https://w3cub.com/
Receivers are asked to report spoofing but not to block it. This is the right first step, and the wrong place to stop.
What to do
Once reports look clean, move to p=quarantine, then p=reject.
asset: w3cub.com
test.w3cub.com appears in Certificate Transparency logs. Names like this usually front staging, admin, or internal tooling, which tends to be patched later and monitored less than production.
What to do
Confirm this host is meant to be public. If not, put it behind SSO or an allow-list.
asset: test.w3cub.com
Lets browsers guess content types, which turns some upload and text endpoints into script injection points.
What to do
Send `X-Content-Type-Options: nosniff` on every response.
asset: https://w3cub.com/
Full URLs — including any tokens or IDs in them — are sent to every third party the page links to.
What to do
Send `Referrer-Policy: strict-origin-when-cross-origin`.
asset: https://w3cub.com/
Mail to this domain can be downgraded to plaintext by an on-path attacker, because senders have no way to know TLS is required.
What to do
Publish an MTA-STS policy (a TXT record plus a small HTTPS-hosted file).
asset: w3cub.com
Any public certificate authority may issue certificates for this domain. CAA lets you name the ones allowed to.
What to do
Add a CAA record naming your CA, e.g. `0 issue "letsencrypt.org"`.
asset: w3cub.com

final https://w3cub.com/status 200time 290msstack cloudflare

✓http:// redirects to https://
✗Strict-Transport-Security
✗Content-Security-Policy
✗Clickjacking protection
✗X-Content-Type-Options
✗Referrer-Policy
–Permissions-Policyoptional
–security.txt publishedoptional — tells researchers where to report bugs

✓Receives mail via 3 servers
route1.mx.cloudflare.net route2.mx.cloudflare.net route3.mx.cloudflare.net
!SPFends in ~all
v=spf1 include:_spf.mx.cloudflare.net ~all
!DMARCp=none
v=DMARC1; p=none; rua=mailto:420bc594785d407fbbea9637cb70d691@dmarc-reports.cloudflare.net
!MTA-STSinbound mail can be downgraded to plaintext

✓DNSSECanswers are signed and validated
–CAAany CA may issue
✓IPv6 (AAAA)
✓2 nameservers
fattouche.ns.cloudflare.com stella.ns.cloudflare.com

✓Registered with Cloudflare, Inc.11.3 years old
w3cub.com
✓Registration expiry256 days
2027-05-21
✓Transfer lock
client transfer prohibited
✓2 nameservers at registry
fattouche.ns.cloudflare.com stella.ns.cloudflare.com

Address	Ports	CVEs	Edge	Network
104.21.8.155 blog.w3cub.com +9	80443205220532082208320862087+5	0	Cloudflare~	—
172.67.188.141 blog.w3cub.com +9	80443205220532082208320862087+5	0	Cloudflare~	—

Archived URLs

Endpoints the Wayback Machine has kept — config files, backups, scripts. Slow to fetch, so it is here on request.

w3cub.com security report

Moderate

Findings

Security headers

Email authentication

DNS

Registration

Hosts

Hostnames