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      <title>CVE-2026-75757 — AshAdmin cookie reader matches names by substring, enabling actor/session shadowing from a sibling subdomain</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-75757</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; ash-project ash_admin&lt;/p&gt;
&lt;p&gt;Reliance on Cookies without Validation and Integrity Checking vulnerability in ash-project ash_admin lets an attacker who controls a sibling subdomain rebind an admin&amp;#39;s session to a different actor, tenant, or authorization mode.&lt;/p&gt;
&lt;p&gt;AshAdmin&amp;#39;s client JavaScript read its state cookies (tenant, actor_resource, actor_primary_key, actor_action, actor_domain, actor_authorizing, actor_paused) by matching the cookie name with an unanchored regular expression (new RegExp(name + &amp;#34;=([^;]+)&amp;#34;)) against the whole document.cookie. Any cookie whose name merely ends with the requested name therefore matches, and whichever is serialized first wins. Because cookies are shared across a registrable domain, a compromised sibling subdomain can set a shadowing cookie (for example xactor_authorizing) with Domain=.example.com that flows unvalidated into the admin&amp;#39;s LiveSocket connect params. The fix matches cookie names by exact equality.&lt;/p&gt;
&lt;p&gt;This issue affects ash_admin: from 0.9.1 before 1.3.1.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; ash-project ash_admin&lt;/p&gt;
&lt;p&gt;Reliance on Cookies without Validation and Integrity Checking vulnerability in ash-project ash_admin lets an attacker who controls a sibling subdomain rebind an admin&amp;#39;s session to a different actor, tenant, or authorization mode.&lt;/p&gt;
&lt;p&gt;AshAdmin&amp;#39;s client JavaScript read its state cookies (tenant, actor_resource, actor_primary_key, actor_action, actor_domain, actor_authorizing, actor_paused) by matching the cookie name with an unanchored regular expression (new RegExp(name + &amp;#34;=([^;]+)&amp;#34;)) against the whole document.cookie. Any cookie whose name merely ends with the requested name therefore matches, and whichever is serialized first wins. Because cookies are shared across a registrable domain, a compromised sibling subdomain can set a shadowing cookie (for example xactor_authorizing) with Domain=.example.com that flows unvalidated into the admin&amp;#39;s LiveSocket connect params. The fix matches cookie names by exact equality.&lt;/p&gt;
&lt;p&gt;This issue affects ash_admin: from 0.9.1 before 1.3.1.&lt;/p&gt;</content:encoded>
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