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      <title>CVE-2026-22880 — Mobile SSO authentication flow allows credential theft via malicious server</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-22880</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Mattermost&lt;/p&gt;
&lt;p&gt;Mattermost Mobile Apps versions &amp;lt;=2.37 11.4 2.0.37 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to properly validate the SSO authentication callback origin which allows an attacker controlling a malicious Mattermost server to steal user credentials for a legitimate Mattermost server via relaying the SSO code exchange flow through the mobile application. Mattermost Advisory ID: MMSA-2025-00564&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Mattermost&lt;/p&gt;
&lt;p&gt;Mattermost Mobile Apps versions &amp;lt;=2.37 11.4 2.0.37 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to properly validate the SSO authentication callback origin which allows an attacker controlling a malicious Mattermost server to steal user credentials for a legitimate Mattermost server via relaying the SSO code exchange flow through the mobile application. Mattermost Advisory ID: MMSA-2025-00564&lt;/p&gt;</content:encoded>
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