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    <lastBuildDate>Wed, 07 Oct 2026 11:50:09 +0000</lastBuildDate>
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      <title>CVE-2026-32109 — Copyparty has unexpected JavaScript execution via crafted URL to folder with `.prologue.html`</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-32109</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; 9001 copyparty&lt;/p&gt;
&lt;p&gt;Copyparty is a portable file server. Prior to 1.20.12, if an attacker has been given both read- and write-permissions to the server, they can upload a malicious file with the filename .prologue.html and then craft a link to potentially execute arbitrary JavaScript in the victim&amp;#39;s context. Note that it is intended behavior that the JavaScript would execute if the target clicks a link to the HTML file itself; &amp;#34;https://example.com/foo/.prologue.html&amp;#34;. The vulnerability is that &amp;#34;https://example.com/foo/?b&amp;#34; would also evaluate the file, making the behavior unexpected. There are existing preventative measures (strict SameSite cookies) which makes it harder to leverage this vulnerability in an attack; in order to gain control of the target&amp;#39;s authenticated session, the link must be clicked from a page served by the server itself -- most likely by editing an existing resource, which would require additional access permissions. Finally, for this attack to be successful, the attacker&amp;#39;s target must click the specific crafted link given by the attacker. This vulnerability is not activated by normally browsing the web-UI on the server. This vulnerability is fixed in 1.20.12.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; 9001 copyparty&lt;/p&gt;
&lt;p&gt;Copyparty is a portable file server. Prior to 1.20.12, if an attacker has been given both read- and write-permissions to the server, they can upload a malicious file with the filename .prologue.html and then craft a link to potentially execute arbitrary JavaScript in the victim&amp;#39;s context. Note that it is intended behavior that the JavaScript would execute if the target clicks a link to the HTML file itself; &amp;#34;https://example.com/foo/.prologue.html&amp;#34;. The vulnerability is that &amp;#34;https://example.com/foo/?b&amp;#34; would also evaluate the file, making the behavior unexpected. There are existing preventative measures (strict SameSite cookies) which makes it harder to leverage this vulnerability in an attack; in order to gain control of the target&amp;#39;s authenticated session, the link must be clicked from a page served by the server itself -- most likely by editing an existing resource, which would require additional access permissions. Finally, for this attack to be successful, the attacker&amp;#39;s target must click the specific crafted link given by the attacker. This vulnerability is not activated by normally browsing the web-UI on the server. This vulnerability is fixed in 1.20.12.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-32109</guid>
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