Booking logo

Booking

booking.com

UpGuard Security Report
Date scanned:

Security rating · scale 0–950 · grades A–F

Booking's UpGuard security rating is B (796 / 950), which is good. 6 of 69 external checks are currently failing, mostly in Website Security and DNS.

Strong

No failing checks in Email, Network, Encryption, IP/Domain Reputation, and Vulnerability Management.

Open risk

Failing checks: X-Frame-Options is not deny or sameorigin; CSP is not implemented; X-Content-Type-Options is not nosniff; and 3 more.

Monitor this vendor
See the 69 checks behind this score

booking.com

Security overview

UpGuard continuously monitors Booking's externally observable security posture across Website Security, Email, Network, DNS, Encryption, Data leakage, IP/Domain Reputation, and Vulnerability Management. The rating reflects only what can be verified from outside the organization. It is not an audit of internal controls.

Free - Track this vendor

Get alerted when Booking's risk changes

UpGuard scans Booking daily across 69 external risk signals. Get notified the moment something changes: a new vulnerability, a breach, or a posture shift.

Monitor this vendor
booking.com security rating

Detailed external checks

The evidence behind the rating. 69 checks across 8 categories, 6 currently failing. Failed checks are listed first.

Website Security

  • X-Frame-Options is not deny or sameorigin

    Browsers may display this website's content in frames. This can lead to clickjacking attacks.

  • CSP is not implemented

    No valid Content Security Policy is implemented. This increases the risk of XSS and clickjacking attacks.

  • X-Content-Type-Options is not nosniff

    Browsers may interpret files as a different MIME type than what is specified in the Content-Type HTTP header. This can lead to MIME confusion attacks.

  • Secure cookies used

    Using secure cookies reduces the risk of third parties intercepting information contained in these cookies.

  • Server information header not exposed

    Ensuring the server information header is not exposed reduces the ability of attackers to exploit certain vulnerabilities.

  • X-Powered-By header not exposed

    Information about specific technology used on the server is obscured.

  • HttpOnly cookies used

    Using HttpOnly cookies reduces the risk of client side script attacks, by preventing cookies being read on the client.

  • Referrer policy is not unsafe-url

    The website's Referrer Policy is not configured to allow unsafe information to be sent in the referrer header.

  • ASP.NET version header not exposing specific ASP.net version

    Ensuring the ASP.NET version header is not exposing a specific version makes it harder for attackers to exploit certain vulnerabilities.

  • ASP.NET version header not exposed

    Ensuring the ASP.NET version header is not exposed makes it harder for attackers to exploit certain vulnerabilities.

  • No unmaintained page detected

    The page appears to be maintained.

Email

  • DMARC policy is not p=none

    DMARC reject policy provides the most effective protection against fraudulent emails being sent from a domain.

  • DMARC policy exists

    DMARC protects against fraudulent emails being sent from a domain.

  • Strict SPF filtering - not using +all

    Sender Policy Framework (SPF) record strictly enforces specific domains allowed to send email on its behalf.

  • SPF syntax correct

    Sender Policy Framework (SPF) record passes basic syntax checks.

  • DMARC policy percentage is default

    DMARC policy percentage is set to default 100%, ensuring all mail is covered by the policy.

  • SPF ptr mechanism not used

    Sender Policy Framework (SPF) record does not include the ptr mechanism.

Network

  • No ports are open

    No open ports were detected.

DNS

  • DNSSEC not enabled

    DNSSEC records prevent third parties from forging the records that guarantee a domain's identity. DNSSEC should be configured for this domain.

  • CAA not enabled

    The domain does not contain a valid Certification Authority Authorization (CAA) record. A CAA record indicates which Certificate Authorities (CAs) are authorized to issue certificates for a domain.

  • No unregistered MX records detected

    No unregistered MX records that could lead to receiving mail on behalf of the target organization were detected.

  • Domain has not expired

    Domain has not expired.

  • No subdomain takeover vulnerability detected

    No dangling DNS records that could lead to subdomain takeover were detected.

  • Domain does not expire soon

    Domain does not expire within 30 days.

  • Domain not flagged as inactive

    Domain is not flagged as inactive.

  • Domain not pending deletion

    Domain is not pending deletion with the registrar.

  • Domain not pending restoration

    Domain is not pending restoration with the registrar.

  • Domain registrar or registry deletion protection enabled

    Domain is protected from unsolicited deletion requests with the registrar or registry.

  • Domain registrar or registry transfer protection enabled

    Domain is protected from unsolicited transfer requests.

  • Domain registrar or registry update protection enabled

    Domain is protected from unsolicited update requests with the registrar or registry.

  • Domain free of registrar DNS resolution hold

    Domain is not under a DNS resolution hold with the registrar.

  • Domain free of registry DNS resolution hold

    Domain is not under a DNS resolution hold with the registry itself.

  • Domain renewal not prohibited by registry

    Domain is not prohibited from renewal at the registry itself.

Encryption

  • Certificate not found on our revoked certificate list

    The site's certificate chain was checked against our list of revoked certificates.

  • SSL available

    SSL is supported for this site.

  • HTTP requests are redirected to HTTPS

    All HTTP requests are redirected to HTTPS.

  • Hostname matches SSL certificate

    The site's hostname matches the SSL certificate.

  • SSL has not expired

    SSL certificate has not expired.

  • Trusted SSL certificate

    The certificate presented by this domain was issued by a trusted certificate authority.

  • HTTP Strict Transport Security (HSTS) enforced

    With HSTS enforced, people browsing this site are less susceptible to man-in-the-middle attacks.

  • No insecure SSL/TLS versions available

    No insecure SSL/TLS versions are available for this site.

  • SSL certificate chain present in server response

    A complete SSL certificate chain was presented by the server for this domain.

  • SSL chain certificates do not expire within 20 days

    SSL intermediate and root certificates do not expire within 20 days.

  • SSL expiration period shorter than 398 days

    The SSL certificate presented by the server has an expiration period shorter than 398 days.

  • SSL has more than 20% of its valid period remaining

    SSL certificate does not expire in less than 20% of its total valid period.

  • Strong SSL algorithm

    Industry standard SHA-256 encryption in use.

  • Domain is included on the HSTS preload list

    Being included on the preload list gives the highest level of protection against MITM attacks for users of all major browsers.

  • Strong public certificate key length

    The site's public certificate provides at least 112 bits of security strength.

  • No weak cipher suites supported in TLS 1.2

    TLS connections to the site do not support any weak cipher suites.

Data leakage

  • Infostealer malware detected

    Infostealer malware has been detected on systems associated with this organization, indicating a potential data breach.

  • No open cloud storage service detected

    No cloud storage service configured to allow anonymous file listing was detected.

  • Domain index is not a listable directory

    The domain index is not a listable directory.

IP/Domain Reputation

  • Not a suspected malware provider

    This website does not appear to contain malicious code.

  • No reports of botnet activity in the last 30 days

    This IP/domain has not been reported as a source of botnet activity in the last 30 days.

  • No reports of brute force login attempts in the last 30 days

    This IP/domain did not appear on any list of IPs and domains known to perform brute force login attempts in the last 30 days.

  • No reports of malware distribution in the last 30 days

    This IP/domain has been reported for distributing malware in the last 30 days.

  • No reports of unsolicited scanning in the last 30 days

    This IP/domain has not been reported for performing unsolicited scanning in the last 30 days.

  • Not suspected of unwanted software

    This website does not appear to be attempting to install unwanted software.

  • Not a suspected phishing page

    This site does not appear to be a forgery or imitation of another website.

  • No reports of phishing activity in the last 30 days

    This IP/domain has not been reported as a phishing site in the last 30 days.

  • No reports of botnet activity in the last 90 days

    This IP/domain has not been reported as a source of botnet activity in the last 90 days.

  • No reports of brute force login attempts in the last 90 days

    This IP/domain did not appear on any list of IPs and domains known to perform brute force login attempts in the last 90 days.

  • No reports of malware distribution in the last 90 days

    This IP/domain has been reported for distributing malware in the last 90 days.

  • No reports of unsolicited scanning in the last 90 days

    This IP/domain has not been reported for performing unsolicited scanning in the last 90 days.

  • No reports of phishing activity in the last 90 days

    This IP/domain has not been reported as a phishing site in the last 90 days.

Vulnerability Management

  • Not vulnerable to CVE-2014-0160 (Heartbleed)

    A bug in OpenSSL's implementation of the TLS heartbeat extension allows access to portions of memory on the targeted host e.g. cryptographic keys and passwords.

  • Not vulnerable to CVE-2014-3566 (POODLE)

    The server does not support SSLv3, and is not vulnerable to the POODLE attack.

  • Not vulnerable to CVE-2015-0204 (FREAK)

    The server does not offer RSA_EXPORT cipher suites, so clients are not vulnerable to the FREAK attack.

  • Not vulnerable to CVE-2015-4000 (Logjam)

    The server is using strong Diffie-Hellman parameters and is not vulnerable to the Logjam attack.

Company info

Company
Booking
Domain
booking.com
Employees
22k+
Location
Seattle, WA, United States
CEO
Glenn Fogel
Industry
Tech
Last updated
November 7, 2026

Related reports

Free - Track this vendor

Get alerted when Booking's risk changes

UpGuard scans Booking daily across 69 external risk signals. Get notified the moment something changes: a new vulnerability, a breach, or a posture shift.

Monitor this vendor
booking.com security rating
View our Security Reports Policy.