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    <lastBuildDate>Thu, 08 Oct 2026 03:04:28 +0000</lastBuildDate>
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      <title>CVE-2026-53674 — BuddyPress 14.4.0 REGEXP Injection via @Mention Username Resolution</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-53674</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; BuddyPress&lt;/p&gt;
&lt;p&gt;BuddyPress 14.4.0 contains a regular expression injection vulnerability in the activity mention resolver that, when username compatibility mode is enabled, allows attackers to manipulate a REGEXP database clause by crafting mention names containing regex metacharacters. Attackers can submit @mentions whose metacharacters pass through esc_sql unescaped and are inserted into an unprepared REGEXP query against the users table, enabling boolean-based inference of usernames and denial of service through catastrophic backtracking.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; BuddyPress&lt;/p&gt;
&lt;p&gt;BuddyPress 14.4.0 contains a regular expression injection vulnerability in the activity mention resolver that, when username compatibility mode is enabled, allows attackers to manipulate a REGEXP database clause by crafting mention names containing regex metacharacters. Attackers can submit @mentions whose metacharacters pass through esc_sql unescaped and are inserted into an unprepared REGEXP query against the users table, enabling boolean-based inference of usernames and denial of service through catastrophic backtracking.&lt;/p&gt;</content:encoded>
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