TutorialsSPF PermError: How to Fix the 10 DNS Lookup Limit Without Breaking Mail
Fix SPF PermError by tracing nested includes, removing stale senders, staying under the 10-DNS-lookup limit, and validating the published policy.
Security Insights Blog
Expert articles on web security, vulnerabilities, and best practices
Tutorials
TutorialsVulnerable JavaScript Library Found: How to Decide What Actually Needs Fixing
A scanner finds an outdated JavaScript library. Before changing production, confirm what was detected, whether it is loaded, which advisory applies, who owns it, and how to verify the live fix.
TutorialsHow to Verify a SQL Injection Fix: Retesting Queries After Remediation
A SQL injection ticket is not finished when the code is merged. Use this retesting workflow to verify parameterization, dynamic identifiers, deployment consistency, and the original finding after remediation.
TutorialsSQL Injection False Positives: How to Validate Scanner Evidence Safely
A scanner says SQL injection, but the evidence is ambiguous. Learn how to separate WAF noise, timing variation, generic errors, and real query manipulation without over-testing production systems.
TutorialsHow to Audit Redirect Chains After a Domain or HTTPS Migration
Learn how to audit redirect chains after a domain, CDN, hosting, or HTTPS migration, find unnecessary hops and insecure transitions, and document a clean redirect baseline.
TutorialsHow to Roll Out HSTS Safely: max-age, includeSubDomains, Preload, and Rollback Planning
Learn how to roll out HSTS safely using staged max-age values, includeSubDomains planning, preload requirements, certificate checks, and a practical rollback strategy.
TutorialsXSS Vulnerability Reports: How to Reproduce, Triage, Fix, and Retest Findings
Learn how to write actionable XSS vulnerability reports with reproducible evidence, source and sink details, severity context, remediation guidance, and retest results.
TutorialsHow to Verify an XSS Fix: Retesting After Remediation
Learn how to retest an XSS fix properly, distinguish real remediation from payload blocking, verify stored and DOM paths, and build regression tests.
TutorialsXSS False Positives: How to Validate a Scanner Finding
Learn how to validate XSS scanner findings, distinguish reflection from real execution, inspect browser context, document evidence, and avoid dismissing true positives.
TutorialsHow to Validate Website Security After a Migration: DNS, TLS, Redirects, Headers, Cookies, and Exposed Files
A step-by-step website migration security checklist covering DNS, TLS, redirects, mixed content, security headers, cookies, exposed files, crawl controls, and final vulnerability validation.