{"id":2852617,"date":"2026-01-03T13:07:52","date_gmt":"2026-01-03T12:07:52","guid":{"rendered":"https:\/\/jng-web.com\/labo\/?p=2852617"},"modified":"2026-01-03T13:07:52","modified_gmt":"2026-01-03T12:07:52","slug":"le-vol-des-mots-de-passe-par-les-extensions-de-navigateur-un-danger-sous-estime-%f0%9f%94%90","status":"publish","type":"post","link":"https:\/\/jng-web.com\/labo\/le-vol-des-mots-de-passe-par-les-extensions-de-navigateur-un-danger-sous-estime-%f0%9f%94%90\/","title":{"rendered":"Le vol des mots de passe par les extensions de navigateur : un danger sous-estim\u00e9 &#x1f510;"},"content":{"rendered":"<div class=\"advads-avant-le-contenu\" id=\"advads-4158202648\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-4944504088214075\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-4944504088214075\" \ndata-ad-slot=\"4514395581\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div><div class=\"advads-test\" style=\"margin-left: auto;margin-right: auto;text-align: center;\" id=\"advads-1642881869\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-4944504088214075\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-4944504088214075\" \ndata-ad-slot=\"4514395581\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div><p data-start=\"205\" data-end=\"605\">Les extensions de navigateur sont devenues des outils du quotidien. Bloqueurs de publicit\u00e9, gestionnaires d\u2019onglets, correcteurs orthographiques ou extensions de productivit\u00e9 : elles promettent confort et gain de temps. Pourtant, derri\u00e8re certaines d\u2019entre elles se cache un risque majeur pour la s\u00e9curit\u00e9 : le vol de mots de passe. Comment cela est-il possible et comment s\u2019en prot\u00e9ger ? D\u00e9cryptage.<\/p>\n<h2 data-start=\"607\" data-end=\"669\">Pourquoi les extensions de navigateur sont-elles risqu\u00e9es ?<\/h2>\n<p data-start=\"671\" data-end=\"794\">Une extension de navigateur fonctionne avec des <strong data-start=\"719\" data-end=\"743\">permissions \u00e9tendues<\/strong>. Pour remplir leur r\u00f4le, elles peuvent acc\u00e9der \u00e0 :<\/p>\n<ul data-start=\"795\" data-end=\"916\">\n<li data-start=\"795\" data-end=\"826\">\n<p data-start=\"797\" data-end=\"826\">Toutes les pages web visit\u00e9es<\/p>\n<\/li>\n<li data-start=\"827\" data-end=\"855\">\n<p data-start=\"829\" data-end=\"855\">Le contenu des formulaires<\/p>\n<\/li>\n<li data-start=\"856\" data-end=\"877\">\n<p data-start=\"858\" data-end=\"877\">Les frappes clavier<\/p>\n<\/li>\n<li data-start=\"878\" data-end=\"916\">\n<p data-start=\"880\" data-end=\"916\">Les cookies et sessions de connexion<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"918\" data-end=\"1099\">Mal configur\u00e9es, trop permissives ou carr\u00e9ment malveillantes, certaines extensions exploitent ces acc\u00e8s pour collecter des donn\u00e9es sensibles, dont les identifiants et mots de passe.<\/p>\n<h2 data-start=\"1101\" data-end=\"1166\">Comment les extensions peuvent-elles voler des mots de passe ?<\/h2>\n<h3 data-start=\"1168\" data-end=\"1216\">1. Interception des formulaires de connexion<\/h3>\n<p data-start=\"1217\" data-end=\"1325\">Les extensions peuvent lire le contenu des champs de formulaire avant leur envoi. Cela permet de r\u00e9cup\u00e9rer :<\/p>\n<ul data-start=\"1326\" data-end=\"1374\">\n<li data-start=\"1326\" data-end=\"1340\">\n<p data-start=\"1328\" data-end=\"1340\">Identifiants<\/p>\n<\/li>\n<li data-start=\"1341\" data-end=\"1356\">\n<p data-start=\"1343\" data-end=\"1356\">Mots de passe<\/p>\n<\/li>\n<li data-start=\"1357\" data-end=\"1374\">\n<p data-start=\"1359\" data-end=\"1374\">Adresses e-mail<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1376\" data-end=\"1448\">Cette technique est discr\u00e8te et difficile \u00e0 d\u00e9tecter pour l\u2019utilisateur.<\/p>\n<h3 data-start=\"1450\" data-end=\"1504\">2. Enregistrement des frappes clavier (keylogging)<\/h3>\n<p data-start=\"1505\" data-end=\"1670\">Certaines extensions peuvent surveiller les frappes clavier sur les pages web. M\u00eame si le mot de passe est masqu\u00e9 \u00e0 l\u2019\u00e9cran, il peut \u00eatre enregistr\u00e9 en arri\u00e8re-plan.<\/p>\n<h3 data-start=\"1672\" data-end=\"1716\">3. Acc\u00e8s aux cookies et sessions actives<\/h3>\n<p data-start=\"1717\" data-end=\"1788\">En r\u00e9cup\u00e9rant les cookies de session, une extension malveillante peut :<\/p>\n<ul data-start=\"1789\" data-end=\"1884\">\n<li data-start=\"1789\" data-end=\"1846\">\n<p data-start=\"1791\" data-end=\"1846\">Se connecter \u00e0 un compte sans conna\u00eetre le mot de passe<\/p>\n<\/li>\n<li data-start=\"1847\" data-end=\"1884\">\n<p data-start=\"1849\" data-end=\"1884\">Usurper l\u2019identit\u00e9 de l\u2019utilisateur<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"1886\" data-end=\"1917\">4. Mise \u00e0 jour malveillante<\/h3>\n<p data-start=\"1918\" data-end=\"2071\">Une extension l\u00e9gitime peut \u00eatre rachet\u00e9e ou compromise. Une mise \u00e0 jour ult\u00e9rieure peut alors introduire du code malveillant sans alerter l\u2019utilisateur.<\/p>\n<h2 data-start=\"2073\" data-end=\"2124\">Extensions l\u00e9gitimes vs extensions malveillantes<\/h2>\n<p data-start=\"2126\" data-end=\"2203\">Toutes les extensions ne sont pas dangereuses. Le probl\u00e8me vient souvent de :<\/p>\n<ul data-start=\"2204\" data-end=\"2359\">\n<li data-start=\"2204\" data-end=\"2238\">\n<p data-start=\"2206\" data-end=\"2238\">Extensions gratuites peu connues<\/p>\n<\/li>\n<li data-start=\"2239\" data-end=\"2262\">\n<p data-start=\"2241\" data-end=\"2262\">D\u00e9veloppeurs anonymes<\/p>\n<\/li>\n<li data-start=\"2263\" data-end=\"2299\">\n<p data-start=\"2265\" data-end=\"2299\">Absence de mises \u00e0 jour r\u00e9guli\u00e8res<\/p>\n<\/li>\n<li data-start=\"2300\" data-end=\"2359\">\n<p data-start=\"2302\" data-end=\"2359\">Permissions excessives par rapport \u00e0 la fonction annonc\u00e9e<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2361\" data-end=\"2505\">M\u00eame sur les boutiques officielles (Chrome Web Store, Firefox Add-ons), des extensions malveillantes parviennent parfois \u00e0 passer les contr\u00f4les.<\/p>\n<h2 data-start=\"2507\" data-end=\"2550\">Les cons\u00e9quences du vol de mots de passe<\/h2>\n<p data-start=\"2552\" data-end=\"2607\">Le vol de mots de passe peut avoir des impacts graves :<\/p>\n<ul data-start=\"2608\" data-end=\"2777\">\n<li data-start=\"2608\" data-end=\"2673\">\n<p data-start=\"2610\" data-end=\"2673\">Piratage de comptes e-mail, r\u00e9seaux sociaux, services bancaires<\/p>\n<\/li>\n<li data-start=\"2674\" data-end=\"2703\">\n<p data-start=\"2676\" data-end=\"2703\">Vol de donn\u00e9es personnelles<\/p>\n<\/li>\n<li data-start=\"2704\" data-end=\"2727\">\n<p data-start=\"2706\" data-end=\"2727\">Usurpation d\u2019identit\u00e9<\/p>\n<\/li>\n<li data-start=\"2728\" data-end=\"2777\">\n<p data-start=\"2730\" data-end=\"2777\">Acc\u00e8s \u00e0 des comptes professionnels ou sensibles<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2779\" data-end=\"2893\">Un seul mot de passe compromis peut suffire \u00e0 ouvrir la porte \u00e0 plusieurs services si l\u2019utilisateur les r\u00e9utilise.<\/p>\n<h2 data-start=\"2895\" data-end=\"2932\">Comment se prot\u00e9ger efficacement ?<\/h2>\n<h3 data-start=\"2934\" data-end=\"2968\">Limiter le nombre d\u2019extensions<\/h3>\n<p data-start=\"2969\" data-end=\"3071\">Installez uniquement les extensions strictement n\u00e9cessaires. Moins il y en a, moins il y a de risques.<\/p>\n<h3 data-start=\"3073\" data-end=\"3101\">V\u00e9rifier les permissions<\/h3>\n<p data-start=\"3102\" data-end=\"3162\">Avant l\u2019installation, v\u00e9rifiez les autorisations demand\u00e9es :<\/p>\n<ul data-start=\"3163\" data-end=\"3289\">\n<li data-start=\"3163\" data-end=\"3228\">\n<p data-start=\"3165\" data-end=\"3228\">M\u00e9fiez-vous des extensions demandant l\u2019acc\u00e8s \u00e0 \u201ctous les sites\u201d<\/p>\n<\/li>\n<li data-start=\"3229\" data-end=\"3289\">\n<p data-start=\"3231\" data-end=\"3289\">Refusez celles dont les permissions ne sont pas justifi\u00e9es<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"3291\" data-end=\"3343\">Utiliser un gestionnaire de mots de passe fiable<\/h3>\n<p data-start=\"3344\" data-end=\"3506\">Les gestionnaires de mots de passe reconnus remplissent les champs de connexion de mani\u00e8re s\u00e9curis\u00e9e, sans exposer les identifiants aux extensions non autoris\u00e9es.<\/p>\n<h3 data-start=\"3508\" data-end=\"3560\">Activer l\u2019authentification \u00e0 deux facteurs (2FA)<\/h3>\n<p data-start=\"3561\" data-end=\"3649\">M\u00eame si un mot de passe est vol\u00e9, le 2FA ajoute une couche de protection suppl\u00e9mentaire.<\/p>\n<h3 data-start=\"3651\" data-end=\"3705\">Supprimer r\u00e9guli\u00e8rement les extensions inutilis\u00e9es<\/h3>\n<p data-start=\"3706\" data-end=\"3795\">Une extension install\u00e9e mais oubli\u00e9e reste active et peut devenir une faille de s\u00e9curit\u00e9.<\/p>\n<h3 data-start=\"3797\" data-end=\"3829\">Mettre \u00e0 jour son navigateur<\/h3>\n<p data-start=\"3830\" data-end=\"3937\">Les navigateurs modernes am\u00e9liorent r\u00e9guli\u00e8rement les m\u00e9canismes de s\u00e9curit\u00e9 et d\u2019isolation des extensions.<\/p>\n<h2 data-start=\"3939\" data-end=\"3952\">Conclusion<\/h2>\n<p data-start=\"3954\" data-end=\"4211\">Les extensions de navigateur sont pratiques, mais elles repr\u00e9sentent aussi une surface d\u2019attaque souvent n\u00e9glig\u00e9e. Le vol de mots de passe par ces extensions est une menace bien r\u00e9elle, aliment\u00e9e par la n\u00e9gligence et le manque de vigilance des utilisateurs.<\/p>\n<p data-start=\"4213\" data-end=\"4468\">Adopter de bonnes pratiques, rester attentif aux permissions et privil\u00e9gier la simplicit\u00e9 sont les meilleures armes pour prot\u00e9ger ses donn\u00e9es personnelles. En mati\u00e8re de cybers\u00e9curit\u00e9, la prudence commence souvent par ce que l\u2019on installe sans y penser &#x1f512;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les extensions de navigateur sont devenues des outils du quotidien. Bloqueurs de publicit\u00e9, gestionnaires d\u2019onglets, correcteurs orthographiques ou extensions de productivit\u00e9 : elles promettent confort &hellip; <\/p>\n","protected":false},"author":2,"featured_media":22517,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[15],"tags":[],"class_list":["post-2852617","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le vol des mots de passe par les extensions de navigateur : un danger sous-estim\u00e9 &#x1f510; - Labo JNG WEB<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jng-web.com\/labo\/le-vol-des-mots-de-passe-par-les-extensions-de-navigateur-un-danger-sous-estime-\ud83d\udd10\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le vol des mots de passe par les extensions de navigateur : un danger sous-estim\u00e9 &#x1f510; - Labo JNG WEB\" \/>\n<meta property=\"og:description\" content=\"Les extensions de navigateur sont devenues des outils du quotidien. 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