Microsoft Defender SmartScreen "This site has been reported as unsafe"

What’s actually happening

Edge throws a red SmartScreen block page, and so does anything else on Microsoft's reputation feed — including Bing and some email link scanners. Users get pushed to go back, and downloads from the domain may be quarantined too. It can fire from a real compromise or as a false positive after a wave of user reports or a flagged shared IP. Visitors can technically click through, but most do not.

Common causes

• A genuine compromise serving phishing pages or malware, the same injection class that also trips Google Safe Browsing
• A flagged or low-reputation hosting IP/range where neighboring sites were malicious
• Mass user "report unsafe site" submissions — a brigading/competitor tactic or fallout from a spammy email campaign
• A brand-new domain with little reputation that resembles a known phishing pattern (lookalike name, sudden traffic)
• Mixed or sketchy content: aggressive redirects, deceptive download buttons, or an SSL/certificate problem that lowers trust signals

How to fix it

1. Determine real vs. false positiveScan the site for injected content first — recently changed files, unknown uploads, obfuscated scripts. If it is genuinely hacked, this is a real detection and you clean it before doing anything else. If it is clean, treat it as a false positive and move to the report below.
2. Clean and re-secure if compromisedRemove the injected files/database entries, patch the vulnerable software, rotate all credentials, and remove any backdoors. SmartScreen will keep blocking as long as the threat is live, so the host has to be actually clean.
3. Submit a report to MicrosoftGo to the Microsoft report page (microsoft.com/wdsi/filesubmission or the SmartScreen feedback link on the block page) and report the site as safe / not a threat. Provide the URL and a short explanation. For a clean site flagged in error, this is the primary lever — there is no Search-Console-style dashboard for SmartScreen.
4. Check the hosting IP's reputationIf you are on shared hosting and a neighbor caused it, ask your host or move to a clean IP. A bad IP neighborhood will keep getting you re-flagged no matter how clean your own files are.
5. Wait for re-evaluation and verifyRe-evaluation typically takes a few days. Re-test in Edge from a machine that has not cached the verdict (or after clearing SmartScreen state) to confirm the block is gone.