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      <title>CVE-2026-44552 — Open WebUI: Redis Cache Keys tool_servers and terminal_servers Missing Instance Prefix Enable Cross-Instance Cache Pois…</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-44552</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; open-webui&lt;/p&gt;
&lt;p&gt;Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the tool_servers and terminal_servers keys in utils/tools.py do use a prefix. When two or more Open WebUI instances share a Redis database (a supported and documented deployment pattern, e.g., for multi-region deployments, blue-green setups, or cluster topologies), the unprefixed keys collide. An admin on Instance A writing to tool_servers overwrites the value read by Instance B — causing Instance B&amp;#39;s users to receive Instance A&amp;#39;s tool server configuration. This vulnerability is fixed in 0.9.0.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; open-webui&lt;/p&gt;
&lt;p&gt;Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the tool_servers and terminal_servers keys in utils/tools.py do use a prefix. When two or more Open WebUI instances share a Redis database (a supported and documented deployment pattern, e.g., for multi-region deployments, blue-green setups, or cluster topologies), the unprefixed keys collide. An admin on Instance A writing to tool_servers overwrites the value read by Instance B — causing Instance B&amp;#39;s users to receive Instance A&amp;#39;s tool server configuration. This vulnerability is fixed in 0.9.0.&lt;/p&gt;</content:encoded>
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