{"id":59383,"date":"2025-09-19T12:30:06","date_gmt":"2025-09-19T12:30:06","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/one-token-to-pwn-them-all-entra-id-bug-could-have-granted-access-to-every-tenant\/"},"modified":"2025-09-19T12:30:06","modified_gmt":"2025-09-19T12:30:06","slug":"one-token-to-pwn-them-all-entra-id-bug-could-have-granted-access-to-every-tenant","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/one-token-to-pwn-them-all-entra-id-bug-could-have-granted-access-to-every-tenant\/","title":{"rendered":"One token to pwn them all: Entra ID bug could have granted access to every tenant"},"content":{"rendered":"<p>A security researcher claims to have found a flaw that could have handed him the keys to almost every Entra ID tenant worldwide.<\/p>\n<p><a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/dirkjanm.io\/obtaining-global-admin-in-every-entra-id-tenant-with-actor-tokens\/\">Dirk-jan Mollema<\/a> reported the finding to the Microsoft Security Research Center (MSRC) in July. The issue was fixed and confirmed as mitigated, and a <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2025-55241\">CVE<\/a> was raised on September 4.<\/p>\n<p>It is, however, an alarming vulnerability involving flawed token validation that can result in cross-tenant access. &#8220;If you are an Entra ID admin,&#8221; wrote Mollema, &#8220;that means complete access to your tenant.&#8221;<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,dmpu,\" data-sm=\",fluid,mpu,dmpu,\" data-md=\",fluid,mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2aNARUBEKvYZL89JEzXpT0gAAAwI&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2aNARUBEKvYZL89JEzXpT0gAAAwI&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>There are two main elements in the vulnerability. The first, according to Mollema, is undocumented impersonation tokens called &#8220;Actor tokens&#8221; that Microsoft uses for service-to-service communication. There was a flaw in the legacy Azure Active Directory Graph API that did not properly validate the originating tenant, allowing the tokens to be used for cross-tenant access.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xmd=\",fluid,mpu,leaderboard,\" data-lg=\",fluid,mpu,leaderboard,\" data-xlg=\",fluid,billboard,superleaderboard,mpu,leaderboard,\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44aNARUBEKvYZL89JEzXpT0gAAAwI&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44aNARUBEKvYZL89JEzXpT0gAAAwI&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33aNARUBEKvYZL89JEzXpT0gAAAwI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33aNARUBEKvYZL89JEzXpT0gAAAwI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>&#8220;Effectively,&#8221; wrote Mollema, &#8220;this means that with a token I requested in my lab tenant I could authenticate as any user, including Global Admins, in any other tenant.&#8221;<\/p>\n<p>The tokens allowed full access to the Azure AD Graph API in any tenant. Any hope that a log might save the day was also dashed \u2013 &#8220;requesting Actor tokens does not generate logs.&#8221;<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xsm=\",fluid,mpu,dmpu,\" data-sm=\",fluid,mpu,dmpu,\" data-md=\",fluid,mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44aNARUBEKvYZL89JEzXpT0gAAAwI&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44aNARUBEKvYZL89JEzXpT0gAAAwI&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>&#8220;Even if it did, they would be generated in my tenant instead of in the victim tenant, which means there is no record of the existence of these tokens.&#8221;<\/p>\n<p>The upshot of the flaw was a possible compromise for any service that uses Entra ID for authentication, such as SharePoint Online or Exchange Online. Mollema noted that access to resources hosted in Azure was also possible.<\/p>\n<p>Microsoft&#8217;s swiftness in resolving the issue is to be commended, even if it&#8217;s unfortunate that it was present in the first place. Additionally, Mollema noted that Microsoft had not detected any abuse of the vulnerability in its internal telemetry.<\/p>\n<p>That said, the researcher has provided some KQL for worried admins to use for tracking down evidence of possible abuse.<\/p>\n<p>Mollema <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/x.com\/_dirkjan\/status\/1968303993689665586\">called<\/a> this &#8220;the most impactful vulnerability I will probably ever find,&#8221; and it is difficult to dispute the claim. The CVE for the issue rates it as &#8220;Critical&#8221; with a &#8220;Low&#8221; Attack Complexity metric. The base score is 10.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" id=\"story_eagle_xsm_sm_md_xmd_lg_xlg\" data-pos=\"mid\" data-raptor=\"eagle\" data-xsm=\",mpu,dmpu,\" data-sm=\",mpu,dmpu,\" data-md=\",mpu,dmpu,\" data-xmd=\",mpu,dmpu,\" data-lg=\",mpu,dmpu,\" data-xlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33aNARUBEKvYZL89JEzXpT0gAAAwI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33aNARUBEKvYZL89JEzXpT0gAAAwI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>To reiterate, according to Microsoft, the vulnerability has been fully mitigated, and users do not need to take any further action.<\/p>\n<p>Still, before the vulnerability was found, there existed, in Mollema&#8217;s words, &#8220;one token to rule them all.&#8221; \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2025\/09\/19\/microsoft_entra_id_bug\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Until Microsoft lobbed it into a virtual volcano A security researcher claims to have found a flaw that could have handed him the keys to almost every Entra ID tenant worldwide.\u2026 READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-59383","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>One token to pwn them all: Entra ID bug could have granted access to every tenant 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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