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      <title>CVE-2026-45061 — Budibase: SSRF via trivial `.tar.gz` substring bypass in Plugin URL upload (`/api/plugin`)</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-45061</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; budibase&lt;/p&gt;
&lt;p&gt;Budibase is an open-source low-code platform. Prior to 3.35.10, the Plugin URL upload endpoint (POST /api/plugin) validates the submitted URL with a single substring check: url.includes(&amp;#34;.tar.gz&amp;#34;). Any URL containing .tar.gz anywhere in the string — in the path, query string, or fragment — passes this check. The URL then proceeds directly to fetchWithBlacklist() with no further validation of host, scheme, or path. Standalone, this vulnerability is blocked by Budibase&amp;#39;s default SSRF blacklist, which covers private IP ranges. But the URL validation layer itself is broken regardless, and it directly enables SSRF in two realistic situations: (1) when chained with the BLACKLIST_IPS bypass ([001]), where the blacklist is empty; and (2) when the plugin server follows HTTP redirects from an external URL to an internal target (the default node-fetch behavior with redirect: &amp;#39;follow&amp;#39;). This vulnerability is fixed in 3.35.10.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; budibase&lt;/p&gt;
&lt;p&gt;Budibase is an open-source low-code platform. Prior to 3.35.10, the Plugin URL upload endpoint (POST /api/plugin) validates the submitted URL with a single substring check: url.includes(&amp;#34;.tar.gz&amp;#34;). Any URL containing .tar.gz anywhere in the string — in the path, query string, or fragment — passes this check. The URL then proceeds directly to fetchWithBlacklist() with no further validation of host, scheme, or path. Standalone, this vulnerability is blocked by Budibase&amp;#39;s default SSRF blacklist, which covers private IP ranges. But the URL validation layer itself is broken regardless, and it directly enables SSRF in two realistic situations: (1) when chained with the BLACKLIST_IPS bypass ([001]), where the blacklist is empty; and (2) when the plugin server follows HTTP redirects from an external URL to an internal target (the default node-fetch behavior with redirect: &amp;#39;follow&amp;#39;). This vulnerability is fixed in 3.35.10.&lt;/p&gt;</content:encoded>
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