Old version
April 14, 2026 06:05 UTC
1c67228d0b3526b615f07c64fe8e77471eace3d8dbb3bbc6e27314e4e4ecc014
CA-V-001810
New version
April 18, 2026 07:54 UTC
fc4948ad7d79233a58c0d7dc1b2101fdab29432cd0e0fd76a835886d1cf86c75
CA-V-001845
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Change Summary
The detected change appears to be a technical update to Booking.com's server-side security infrastructure rather than a substantive modification to privacy terms. The HTML document containing security challenge code was updated with new nonce values and timestamps, which are routine security measures that prevent token reuse. This type of update does not materially alter what data Booking.com collects, uses, or discloses about users.
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="17761467425430.45032369161781605"> 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="17761467425430.45032369161781605"> window.awsWafCookieDomainList = ['booking.com']; </script> <script type="text/javascript" src="https://www.booking.com/__challenge_h78IRKX3kpQxScCExxShBNwRUlb/d8c14d4960ca/a18a4859af9c/challenge.js" nonce="17761467425430.45032369161781605"></script> <script type="text/javascript" nonce="17761467425430.45032369161781605"> 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="17761467425430.45032369161781605"> 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: 1776146742543, 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="17764988588080.039723937494515305"> 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="17764988588080.039723937494515305"> window.awsWafCookieDomainList = ['booking.com']; </script> <script type="text/javascript" src="https://www.booking.com/__challenge_h78IRKX3kpQxScCExxShBNwRUlb/d8c14d4960ca/a18a4859af9c/challenge.js" nonce="17764988588080.039723937494515305"></script> <script type="text/javascript" nonce="17764988588080.039723937494515305"> 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="17764988588080.039723937494515305"> 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: 1776498858808, 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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