Old version
April 1, 2026 06:06 UTC
b85e73f31758e68a68d302317546356e453b31ad8ce447ab0a5fcfe1bd7a03ac
CA-V-000410
New version
April 2, 2026 06:05 UTC
1ba9eb715c989d70fd223edb6044086cf85ec5fd0d604dcdfe2cf94c49f7291e
CA-V-001740
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Change Summary
The change detected in the Booking.com terms of service appears to be a technical update to a security challenge page that users may encounter when accessing the site. The modifications involve updates to internal nonce values and timestamp parameters used in Booking.com's security infrastructure, specifically how the browser communicates with Booking.com's servers during bot verification. This is a routine security and infrastructure update with no direct impact on the terms, rights, or obligations stated in Booking.com's actual Terms and Conditions document.
low severity
0 Sentences added
0 Sentences removed
1 Sentences modified
3 Sentences before
3 Sentences after
Added
Removed
Modified
BeforeAfter
0<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title></title> <style> body { font-family: "Arial"; } </style> <script type="text/javascript" nonce="17750235776510.9180723941820086"> function getAjaxObject() { var ajax; if (window.XMLHttpRequest) { try { ajax = new window.XMLHttpRequest(); // XMLHttpRequest (Mozilla, Opera, Safari, etc.) } catch (e) { return false; } } else { var msXML = new Array( // XMLHttpRequest (IE with ActiveX) "Msxml2.XMLHTTP.5.0", "Msxml2.XMLHTTP.4.0", "Msxml2.XMLHTTP.3.0", "Msxml2.XMLHTTP", "Microsoft.XMLHTTP" ); for (var i = 0; i < msXML.length; i++) { // We want to get the best we can try { ajax = new ActiveXObject(msXML[i]); break; } catch (e) { return false; } } } return ajax; } function sendAjaxRequest(url, data, callback) { const xhr = getAjaxObject(); if (!xhr) { callback(new Error('Unable to create XMLHttpRequest object'), null); return; } xhr.open('POST', url, true); xhr.setRequestHeader('Content-Type', 'application/json'); xhr.setRequestHeader('Accept', 'application/json'); xhr.onreadystatechange = function() { if (xhr.readyState === 4) { if (xhr.status >= 200 && xhr.status < 300) { try { const response = JSON.parse(xhr.responseText); callback(null, response); } catch (error) { callback(error, null); } } else { callback(new Error('HTTP error! status: ' + xhr.status), null); } } }; xhr.onerror = function() { callback(new Error('Network error'), null); }; xhr.send(JSON.stringify(data)); } function reportChallengeError(log, challengeError) { try { sendAjaxRequest( 'https://reports.booking.com/chal_report', { log: log, message: challengeError.message, stack: challengeError.stack }, (e, response) => { if (e) { console.error('Request failed:', e); } else { console.log('Success:', response); } } ); } catch (e) {} } function setupErrorHandling() { // Handle JavaScript errors window.addEventListener('error', function(event) { var error = { message: event.message, stack: event.error ? event.error.stack : '' }; reportChallengeError('javascript_error', error); }); // Handle unhandled promise rejections window.addEventListener('unhandledrejection', function(event) { var error = { message: event.reason && event.reason.message ? event.reason.message : 'Unhandled Promise Rejection', stack: event.reason && event.reason.stack ? event.reason.stack : '' }; reportChallengeError('promise_rejection', error); }); } // Initialize error handling setupErrorHandling(); </script> <script type="text/javascript" nonce="17750235776510.9180723941820086"> window.awsWafCookieDomainList = ['booking.com']; </script> <script type="text/javascript" src="https://www.booking.com/__challenge_h78IRKX3kpQxScCExxShBNwRUlb/d8c14d4960ca/a18a4859af9c/challenge.js" nonce="17750235776510.9180723941820086"></script> <script type="text/javascript" nonce="17750235776510.9180723941820086"> const maxLocationLength = 2047 - "&chal_t=1760623098515&force_referer=".length; function searchStringWithNewParam(search, key, value) { value = encodeURIComponent(value); if (!search.startsWith('?')) { return search + `?${key}=${value}`; } else if (search.endsWith('&')) { return search + `${key}=${value}`; } else { return search + `&${key}=${value}`; } } function getNewUrlWithAddedParameter(location, parameters) { let newSearch = location.search; for (let parameterName of Object.keys(parameters)) { if (!newSearch.includes(`${parameterName}=`)) { newSearch = searchStringWithNewParam(newSearch, parameterName, parameters[parameterName]); } } let newHref = `${location.pathname}${newSearch}${location.hash}`; if (newHref.length < maxLocationLength) { return newHref; } return null; } </script> </head> <body> <div id="challenge-container"></div> <script type="text/javascript" nonce="17750235776510.9180723941820086"> let newHref; try { setTimeout(() => { try { reportChallengeError("Reloaded without updating url", new Error("")); } catch (e) {} document.location.reload(); }, 20000); let referrer = document.referrer; let availableLength = maxLocationLength - document.location.href.length; if (encodeURIComponent(referrer).length > availableLength) { let parsedReferrer = new URL(referrer); referrer = parsedReferrer.origin; if (encodeURIComponent(referrer + parsedReferrer.pathname).length < availableLength) { referrer = referrer + parsedReferrer.pathname; } } let parameters = { chal_t: 1775023577651, force_referer: referrer, }; newHref = getNewUrlWithAddedParameter(document.location, parameters); } catch (e) { reportChallengeError("Failed while getting new href", e); } newHref = newHref || document.location.href; AwsWafIntegration.saveReferrer(); AwsWafIntegration.checkForceRefresh().then((forceRefresh) => { if (forceRefresh) { AwsWafIntegration.forceRefreshToken().then(() => { window.location.href = newHref; }); } else { AwsWafIntegration.getToken().then(() => { window.location.href = newHref; }); } }); </script> <noscript> <h1>JavaScript is disabled</h1> In order to continue, we need to verify that you're not a robot.0<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title></title> <style> body { font-family: "Arial"; } </style> <script type="text/javascript" nonce="17751099238310.22433067832349785"> function getAjaxObject() { var ajax; if (window.XMLHttpRequest) { try { ajax = new window.XMLHttpRequest(); // XMLHttpRequest (Mozilla, Opera, Safari, etc.) } catch (e) { return false; } } else { var msXML = new Array( // XMLHttpRequest (IE with ActiveX) "Msxml2.XMLHTTP.5.0", "Msxml2.XMLHTTP.4.0", "Msxml2.XMLHTTP.3.0", "Msxml2.XMLHTTP", "Microsoft.XMLHTTP" ); for (var i = 0; i < msXML.length; i++) { // We want to get the best we can try { ajax = new ActiveXObject(msXML[i]); break; } catch (e) { return false; } } } return ajax; } function sendAjaxRequest(url, data, callback) { const xhr = getAjaxObject(); if (!xhr) { callback(new Error('Unable to create XMLHttpRequest object'), null); return; } xhr.open('POST', url, true); xhr.setRequestHeader('Content-Type', 'application/json'); xhr.setRequestHeader('Accept', 'application/json'); xhr.onreadystatechange = function() { if (xhr.readyState === 4) { if (xhr.status >= 200 && xhr.status < 300) { try { const response = JSON.parse(xhr.responseText); callback(null, response); } catch (error) { callback(error, null); } } else { callback(new Error('HTTP error! status: ' + xhr.status), null); } } }; xhr.onerror = function() { callback(new Error('Network error'), null); }; xhr.send(JSON.stringify(data)); } function reportChallengeError(log, challengeError) { try { sendAjaxRequest( 'https://reports.booking.com/chal_report', { log: log, message: challengeError.message, stack: challengeError.stack }, (e, response) => { if (e) { console.error('Request failed:', e); } else { console.log('Success:', response); } } ); } catch (e) {} } function setupErrorHandling() { // Handle JavaScript errors window.addEventListener('error', function(event) { var error = { message: event.message, stack: event.error ? event.error.stack : '' }; reportChallengeError('javascript_error', error); }); // Handle unhandled promise rejections window.addEventListener('unhandledrejection', function(event) { var error = { message: event.reason && event.reason.message ? event.reason.message : 'Unhandled Promise Rejection', stack: event.reason && event.reason.stack ? event.reason.stack : '' }; reportChallengeError('promise_rejection', error); }); } // Initialize error handling setupErrorHandling(); </script> <script type="text/javascript" nonce="17751099238310.22433067832349785"> window.awsWafCookieDomainList = ['booking.com']; </script> <script type="text/javascript" src="https://www.booking.com/__challenge_h78IRKX3kpQxScCExxShBNwRUlb/d8c14d4960ca/a18a4859af9c/challenge.js" nonce="17751099238310.22433067832349785"></script> <script type="text/javascript" nonce="17751099238310.22433067832349785"> const maxLocationLength = 2047 - "&chal_t=1760623098515&force_referer=".length; function searchStringWithNewParam(search, key, value) { value = encodeURIComponent(value); if (!search.startsWith('?')) { return search + `?${key}=${value}`; } else if (search.endsWith('&')) { return search + `${key}=${value}`; } else { return search + `&${key}=${value}`; } } function getNewUrlWithAddedParameter(location, parameters) { let newSearch = location.search; for (let parameterName of Object.keys(parameters)) { if (!newSearch.includes(`${parameterName}=`)) { newSearch = searchStringWithNewParam(newSearch, parameterName, parameters[parameterName]); } } let newHref = `${location.pathname}${newSearch}${location.hash}`; if (newHref.length < maxLocationLength) { return newHref; } return null; } </script> </head> <body> <div id="challenge-container"></div> <script type="text/javascript" nonce="17751099238310.22433067832349785"> let newHref; try { setTimeout(() => { try { reportChallengeError("Reloaded without updating url", new Error("")); } catch (e) {} document.location.reload(); }, 20000); let referrer = document.referrer; let availableLength = maxLocationLength - document.location.href.length; if (encodeURIComponent(referrer).length > availableLength) { let parsedReferrer = new URL(referrer); referrer = parsedReferrer.origin; if (encodeURIComponent(referrer + parsedReferrer.pathname).length < availableLength) { referrer = referrer + parsedReferrer.pathname; } } let parameters = { chal_t: 1775109923831, force_referer: referrer, }; newHref = getNewUrlWithAddedParameter(document.location, parameters); } catch (e) { reportChallengeError("Failed while getting new href", e); } newHref = newHref || document.location.href; AwsWafIntegration.saveReferrer(); AwsWafIntegration.checkForceRefresh().then((forceRefresh) => { if (forceRefresh) { AwsWafIntegration.forceRefreshToken().then(() => { window.location.href = newHref; }); } else { AwsWafIntegration.getToken().then(() => { window.location.href = newHref; }); } }); </script> <noscript> <h1>JavaScript is disabled</h1> In order to continue, we need to verify that you're not a robot.
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