Intruder Systems Ltd · Technology · United Kingdom
Low risk. 3 critical or high findings in Security headers and SSL/TLS.
Intruder Systems Ltd operates a sophisticated SaaS platform specializing in vulnerability management and attack surface discovery. Founded in 2015 and headquartered in the UK, Intruder serves over 2,500 customers globally, positioning itself as a trusted leader in cybersecurity solutions. Their platform integrates real-time asset discovery, continuous vulnerability scanning, exposure management, and intelligent prioritization using threat intelligence, catering primarily to security teams and IT professionals across various industries. Technically, the website leverages modern web technologies including Webflow CMS, HubSpot for CRM and forms, and multiple analytics and tracking tools such as Google Analytics, Hotjar, and PostHog. The site is well-optimized for performance, mobile responsiveness, and accessibility, reflecting a mature digital infrastructure. Security best practices are evident with HTTPS enforcement, comprehensive security headers, and cookie consent mechanisms. From a security posture perspective, Intruder demonstrates strong adherence to industry standards, holding certifications like SOC 2, ISO 27001, PCI DSS, and HIPAA. The website content and infrastructure show no critical vulnerabilities or exposed sensitive data. However, the absence of a public incident response contact or vulnerability disclosure page suggests room for improvement in transparency and incident readiness. Overall, Intruder presents a low-risk profile with a professional, trustworthy online presence. Strategic recommendations include publishing explicit incident response contacts, establishing a vulnerability disclosure policy, and continuous monitoring of third-party scripts to maintain security integrity.
Scanned
NIS2 Art. 21(2)
This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.
GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.
3 findings rated critical or high. Fix these first.
Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.
Prevents clickjacking attacks
What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"
Controls resources the browser is allowed to load
What to do: Implement a Content-Security-Policy appropriate for your application
TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.
Server supports weak protocols: TLSv1.1
What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions
Need hands-on remediation? Email guard@offseq.com
This scan found 18 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.
€25per month
Email alerts on material changes and an exportable JSON history of every change.
Billed monthly to your card. Cancel anytime. See sample alerts.
€39.90one-time
Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.
Each check with its score, findings and the evidence it collected.
The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.
Counted in this score
Not counted
Findings that cap the score at 49
Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.
Partial scans
When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.
Risk levels
Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.
Leaked records that mention intruder.io, from OffSeq Breach.
5 subdomains affected
See the 10 newest leaked credentials
A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for intruder.io.
Select it in the checkout above.
Breach keeps ingesting new leaks, so these numbers can grow between scans.
Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.
Automated reading of the public site. Ratings are indicative.
Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.
Retrieved 2026-10-25
Rate this report, add an optional comment, and tell us if you want a security specialist to follow up.
Reviews of this site
Share your experience with intruder.io. Every review is verified by email and published after moderation.
Community rating
No published reviews yet. Be the first to review intruder.io.