Website Malware & Security Scanner

Check your site for malware blocklist appearances, exposed configuration files, and the security misconfigurations that make malware attacks possible — free, from outside your server, no install required.

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What is website malware and how does it spread?

Website malware is malicious code injected into or hosted on a web server with the intent to harm visitors, steal data, or recruit the server into a botnet. Unlike desktop malware, which targets individual machines, website malware operates at the server or CDN layer — meaning a single compromised site can expose every visitor, regardless of which device or browser they use.

Infection typically happens through one of several vectors. The most common in 2026 is the supply-chain attack: a third-party JavaScript library or WordPress plugin is compromised upstream, and thousands of sites that include it automatically begin serving malicious code. A close second is credential theft — attackers obtain FTP credentials, hosting control-panel passwords, or CMS admin logins through phishing or data breaches, then upload malware directly. Vulnerable CMS plugins and themes that have not been updated also provide a common entry point: public CVE databases contain thousands of known WordPress plugin vulnerabilities, many with working exploits.

Once present, malware can take many forms: JavaScript that skims payment card data, redirects that send visitors to phishing pages, hidden iframes that load drive-by download exploits, spam pages injected to manipulate search rankings, or cryptomining scripts that consume visitor CPU. In many cases, the site owner is the last to know — browsers and search engines may flag the site for weeks before a human notices.

What a website malware and security scanner detects

A remote website malware and security scanner — one that operates without server access — cannot read your server's file system or execute antivirus signatures against PHP files the way a server-installed tool can. It is important to be clear about this. What remote scanning can do is check the publicly observable surface of your site for signals that correlate strongly with compromise or elevated malware risk:

  • Blocklist and threat-intelligence lookups — whether your domain or hosting IP appears on public feeds such as Google Safe Browsing, Spamhaus, Surbl, or known-bad-actor registries. Blocklist appearance is a strong lagging indicator of active or recent malware infection.
  • Exposed configuration and backup files — reachable .env files, database dumps, wp-config.php backups, and similar paths that leak credentials attackers use to plant malware. Exposure of these files is a pre-infection risk signal, not a confirmation of infection.
  • Missing Content-Security-Policy headers — a CSP header restricts which external scripts can run on your page. Sites without a CSP are significantly more vulnerable to JavaScript injection attacks, including the supply-chain attacks described above.
  • Weak or misconfigured TLS — expired certificates or support for deprecated TLS 1.0/1.1 can enable man-in-the-middle attacks that allow injecting malicious content between your server and visitors.
  • Subresource Integrity (SRI) signals — whether third-party scripts are loaded with cryptographic integrity checks. Missing SRI on CDN-hosted scripts is a common attack vector for supply-chain malware.
  • Suspicious redirect chains — unexpected redirects to unfamiliar domains can be a symptom of malware that redirects visitors to phishing or malware-distribution pages.

These surface-level checks make Vuln0x useful as an early-warning system and a proactive risk-reduction tool. They are not a substitute for server-side antivirus scanning when active infection is suspected.

What Vuln0x does not do — and why that matters

We believe in being honest about tool scope. Vuln0x is a remote, passive surface scanner. It operates exactly as a search-engine bot or an attacker with no special access would: it makes HTTP requests to your publicly reachable URLs and analyses the responses. It does not and cannot:

  • Read files on your server that are not reachable via HTTP. An infected PHP file hidden deep in your web root, not served by any public route, is invisible to a remote scanner.
  • Run antivirus signature databases against your code. Tools like Wordfence (WordPress), Imunify360, or ClamAV do this at the file-system level and require server installation.
  • Detect malware that injects content only under specific conditions — for example, code that only activates for visitors referred from a search engine, making it invisible to a direct scanner request.

If you have reason to believe your site is actively infected — visitors are reporting warnings, Google Search Console shows a malware notice, or your host has flagged suspicious activity — the right response is to combine a remote surface check with a server-side tool, restore from a known-clean backup, and rotate all credentials associated with the hosting account.

Where Vuln0x adds the most value is before infection: identifying the misconfigurations and exposures that make malware attacks possible so you can close them proactively.

How to use Vuln0x as a free website malware scanner

Using Vuln0x takes under a minute and requires no installation:

  1. Enter your domain or URL in the scan box at the top of the website security scanner page and click Scan free.
  2. Within seconds, receive an A+ to F security grade. The summary will call out blocklist status, missing critical headers, TLS issues, and any obviously exposed sensitive paths discovered during the passive check.
  3. Register for a free Vuln0x account (no credit card required) to unlock the full scan. The full scan runs 40+ engines in parallel and includes deeper exposed-file discovery, JavaScript library version checks, CORS analysis, and the full set of application vulnerability probes described on the website vulnerability scanner page.
  4. Act on findings. The report prioritises issues by severity and provides specific remediation steps — from adding a CSP header to removing an exposed backup file to updating a vulnerable plugin.
  5. Schedule regular scans (daily, weekly, or monthly) so that new misconfigurations introduced by deployments are caught quickly rather than discovered after an incident.

Malware scanning and vulnerability scanning — how they fit together

Malware scanning and vulnerability scanning address different parts of the same threat model. Malware scanning looks for evidence of compromise and for the surface-level conditions that enable it. Vulnerability scanning looks for the specific exploitable flaws that attackers use to achieve compromise in the first place.

Run together, they give a more complete picture: the vulnerability scan tells you which doors are unlocked; the security and malware scan tells you whether any of those doors have already been opened. Vuln0x integrates both into a single platform so you do not need to maintain separate tools, correlate separate reports, or maintain separate integrations with your CI/CD pipeline.

For teams that want to embed this into their development workflow, the Vuln0x API and GitHub Actions integration allow you to gate deployments on a minimum security score — catching regressions automatically before they reach production.

Frequently asked questions

Can Vuln0x detect malware on my website?
Vuln0x performs passive surface checks: it checks whether your domain appears on public blocklists and threat-intelligence feeds, looks for obviously exposed files that are common malware delivery vectors, and checks security headers that help prevent malicious script injection. It does not perform deep server-side antivirus scanning or inspect your server's file system — that would require server access that a remote scanner does not have. If you suspect active infection, a server-side scanner with file-system access is the right next step.
What is a website malware and security scanner?
A website malware and security scanner checks your site from the outside — the same perspective an attacker or visitor has. It looks for signs that a site may be compromised or at elevated malware risk: blocklist appearances, missing security headers that would allow script injection, exposed configuration files, and weak TLS that could enable man-in-the-middle attacks. It complements — but does not replace — server-side antivirus tools that scan the file system directly.
How do sites get infected with malware?
The most common infection vectors are compromised credentials (FTP, CMS admin, hosting control panels), vulnerable plugins or themes in CMS platforms like WordPress, exposed configuration files that leak database passwords, and supply-chain attacks via third-party JavaScript. A security scanner helps close the exposure surface that makes these attacks possible, but preventing infection ultimately requires keeping software updated, using strong unique passwords, and monitoring for changes to served files.
What is the difference between a free website malware scanner and a paid one?
Free scanners — including Vuln0x's passive check — operate from outside the server and check publicly observable signals: blocklists, headers, exposed URLs, and TLS quality. Paid or server-installed tools can access the file system directly, scan PHP/JavaScript source files for known malware signatures, and monitor for file changes in real time. For most sites, the free surface check is a good first step; server-side scanning adds coverage for active infections already present on disk.

Check your site for malware signals and misconfigs — free

No install, no account for the quick check. See your security grade in seconds and get a clear list of what to fix first.

Scan your website free