[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"framework:mitre-attack\u002Ft1539":3},{"item":4,"lessons":18,"controls":68,"related":99},{"family":5,"item":6,"code":7,"title":8,"citations":9,"publisher":10,"summary_md":11,"official_text":12,"official_attribution":13,"official_url":14,"link_label":15,"note":16,"updated_at":17},"mitre-attack","t1539","T1539","Steal Web Session Cookie",42,"MITRE","**What attackers do.** Attackers steal session cookies from browsers or intercept them in transit, then replay them to access web applications and cloud services as the victim. Because the session is already authenticated, this can bypass passwords and MFA. It serves the Credential Access tactic.\n\n**How to defend.** Shorten session lifetimes for sensitive applications, bind sessions to devices where the platform supports it, and require re-authentication for high-risk actions. Protect endpoints against infostealer malware and adversary-in-the-middle phishing kits, and prefer phishing-resistant MFA. Identity provider and application logs should record session origin details so reuse can be spotted.\n\n**Signs to look for.** Look for the same session used from a new IP address, country or device shortly after a legitimate login, and processes reading browser cookie stores that are not the browser itself. A common gap is treating a valid session token as proof of the user, without checking context.","An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials. Web applications and services often use session cookies as an authentication token after a user has authenticated to a website.\n\nCookies are often valid for an extended period of time, even if the web application is not actively used. Cookies can be found on disk, in the process memory of the browser, and in network traffic to remote systems. Additionally, other applications on the targets machine might store sensitive authentication cookies in memory (e.g. apps which authenticate to cloud services). Session cookies can be used to bypasses some multi-factor authentication protocols.\n\nThere are several examples of malware targeting cookies from web browsers on the local system. Adversaries may also steal cookies by injecting malicious JavaScript content into websites or relying on User Execution by tricking victims into running malicious JavaScript in their browser.","© The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation (MITRE ATT&CK®).","https:\u002F\u002Fattack.mitre.org\u002Ftechniques\u002FT1539\u002F","Open the technique on MITRE ATT&CK",null,"2026-10-18T15:18:43.663+00:00",{"total":9,"list":19},[20,24,28,32,36,40,44,48,52,56,60,64],{"slug":21,"title":22,"published_at":23},"fake-ai-ad-portals-steal-credentials-and-mfa-codes-via-browser-in-the-browser-phishing","Fake AI Ad Portals Steal Credentials and MFA Codes via Browser-in-the-Browser Phishing","2026-10-06T22:21:47.539+00:00",{"slug":25,"title":26,"published_at":27},"browser-based-attacks-bypass-edr-by-exploiting-legitimate-sessions","Browser-Based Attacks Bypass EDR by Exploiting Legitimate Sessions","2026-10-02T16:21:18.74+00:00",{"slug":29,"title":30,"published_at":31},"malicious-firefox-extension-steals-google-session-cookies-via-deferred-payload","Malicious Firefox Extension Steals Google Session Cookies via Deferred Payload","2026-09-24T00:20:42.508+00:00",{"slug":33,"title":34,"published_at":35},"ai-powered-phishing-as-a-service-platform-steals-session-tokens-from-12000-accounts","AI-Powered Phishing-as-a-Service Platform Steals Session Tokens from 12,000+ Accounts","2026-09-22T16:21:01.155+00:00",{"slug":37,"title":38,"published_at":39},"ai-driven-malware-operates-autonomously-using-llms-for-command-control","AI-Driven Malware Operates Autonomously Using LLMs for Command & Control","2026-09-22T13:20:42.503+00:00",{"slug":41,"title":42,"published_at":43},"kremlin-banking-malware-forces-malicious-browser-extensions-by-bypassing-integrity-checks","KREMLIN Banking Malware Forces Malicious Browser Extensions by Bypassing Integrity Checks","2026-09-16T20:20:20.314+00:00",{"slug":45,"title":46,"published_at":47},"kremlin-banking-malware-hijacks-browsers-to-steal-credentials-via-malicious-extensions","KREMLIN Banking Malware Hijacks Browsers to Steal Credentials via Malicious Extensions","2026-09-15T20:20:46.165+00:00",{"slug":49,"title":50,"published_at":51},"passkey-phishing-campaigns-harvest-microsoft-365-credentials-and-session-tokens","Passkey-Phishing Campaigns Harvest Microsoft 365 Credentials and Session Tokens","2026-09-11T18:20:23.292+00:00",{"slug":53,"title":54,"published_at":55},"session-hijacking-bypasses-mfa-as-top-identity-threat","Session Hijacking Bypasses MFA as Top Identity Threat","2026-09-10T16:22:56.996+00:00",{"slug":57,"title":58,"published_at":59},"passkey-themed-phishing-hijacks-cloud-identities-and-mfa-sessions","Passkey-Themed Phishing Hijacks Cloud Identities and MFA Sessions","2026-09-09T20:20:58.799+00:00",{"slug":61,"title":62,"published_at":63},"vishing-token-theft-campaign-targets-executives-via-fake-it-calls","Vishing & Token Theft Campaign Targets Executives via Fake IT Calls","2026-09-07T18:20:45.153+00:00",{"slug":65,"title":66,"published_at":67},"aitm-phishing-service-bypasses-mfa-at-hundreds-of-organizations","AiTM Phishing Service Bypasses MFA at Hundreds of Organizations","2026-09-07T16:20:25.374+00:00",[69,74,79,84,89,94],{"slug":70,"name":71,"problem":72,"stories":73},"phishing-resistant-mfa","Phishing-resistant MFA","A stolen password, or a user who taps Approve on a push prompt, is no longer enough to log in.",26,{"slug":75,"name":76,"problem":77,"stories":78},"identity-threat-detection","Identity threat detection and response (ITDR)","Attackers who log in with real, stolen credentials get noticed.",25,{"slug":80,"name":81,"problem":82,"stories":83},"email-security","Email security","Phishing, malware and invoice fraud are filtered out before they reach inboxes.",23,{"slug":85,"name":86,"problem":87,"stories":88},"endpoint-detection-response","Endpoint detection and response (EDR and XDR)","Malware and hands-on-keyboard attackers on laptops and servers get spotted and stopped.",20,{"slug":90,"name":91,"problem":92,"stories":93},"security-awareness-training","Security awareness training and phishing simulation","People recognise and report attacks instead of falling for them.",8,{"slug":95,"name":96,"problem":97,"stories":98},"data-loss-prevention","Data loss prevention (DLP)","Sensitive data cannot quietly leave by email, upload, USB stick or AI tool.",4,[100,106,112,118,123,127,132,136],{"family":101,"item":102,"code":103,"title":104,"together":105},"gdpr","32","Article 32","Security of processing",41,{"family":107,"item":108,"code":109,"title":110,"together":111},"cis","6","Control 6","Access Control Management",30,{"family":113,"item":114,"code":115,"title":116,"together":117},"nist-800-53","si-3","SI-3","Malicious Code Protection",29,{"family":119,"item":120,"code":121,"title":122,"together":73},"nist-sp","800-63","SP 800-63","SP 800-63: Digital Identity Guidelines",{"family":113,"item":124,"code":125,"title":126,"together":78},"ac-17","AC-17","Remote Access",{"family":113,"item":128,"code":129,"title":130,"together":131},"ac-2","AC-2","Account Management",22,{"family":107,"item":133,"code":134,"title":135,"together":131},"14","Control 14","Security Awareness and Skills Training",{"family":107,"item":137,"code":138,"title":139,"together":140},"4","Control 4","Secure Configuration of Enterprise Assets and Software",18]