root@thehacksparrow:~/writeups$ SYSTEM ONLINE
root@sparrow:~/writeups$ cat securityheaders.md
// tools

SecurityHeaders.com

22 Jul 2026 · 2 min read

What it is — SecurityHeaders.com (created by Scott Helme) analyses any website's HTTP security headers and grades it from A+ to F: it checks Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and several more.

TypeFree web service
CostFree
URLsecurityheaders.com

How to use it

Enter the URL and get the report in seconds. It can also be checked from the command line without the site:

curl -sI https://target.com | grep -iE 'content-security-policy|strict-transport|x-frame|x-content-type'

A low grade isn't an exploitable vulnerability by itself, but it points out where defence layers are missing: without CSP, a reflected XSS that would otherwise be mitigated becomes fully exploitable; without X-Frame-Options, the site is vulnerable to clickjacking.

What I use it for

  • Quick triage in bug bounty: a 10-second check that tells me whether it's worth digging for XSS (without CSP, the impact of finding one is much higher) or whether there are protections that will limit its exploitability.
  • Report context: when reporting an XSS, mentioning the lack of CSP helps justify severity to the program's triager.
  • Comparing before/after: after reporting something and it getting fixed, I re-check the headers to confirm the fix actually shipped.

Link

securityheaders.com →