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      <title>CVE-2026-42554 — Fiber: XSS in AutoFormat Content Negotiation</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-42554</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; gofiber fiber&lt;/p&gt;
&lt;p&gt;Fiber is a web framework for Go. Prior to 2.52.12 and 3.1.0, Cross-Site Scripting vulnerability in Go Fiber allows a remote attacker to inject arbitrary HTML/JavaScript by supplying Accept: text/html on any request whose handler passes attacker-influenced data to the AutoFormat() feature. The developer opts into content negotiation by calling AutoFormat(), but does not opt into raw HTML emission for a particular request; Fiber chooses that branch from attacker-controlled Accept. The html branch is the sole outlier in a method whose name (AutoFormat) and symmetrical structure actively telegraph &amp;#34;safe, format-agnostic reply.&amp;#34; This vulnerability is fixed in 2.52.12 and 3.1.0.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; gofiber fiber&lt;/p&gt;
&lt;p&gt;Fiber is a web framework for Go. Prior to 2.52.12 and 3.1.0, Cross-Site Scripting vulnerability in Go Fiber allows a remote attacker to inject arbitrary HTML/JavaScript by supplying Accept: text/html on any request whose handler passes attacker-influenced data to the AutoFormat() feature. The developer opts into content negotiation by calling AutoFormat(), but does not opt into raw HTML emission for a particular request; Fiber chooses that branch from attacker-controlled Accept. The html branch is the sole outlier in a method whose name (AutoFormat) and symmetrical structure actively telegraph &amp;#34;safe, format-agnostic reply.&amp;#34; This vulnerability is fixed in 2.52.12 and 3.1.0.&lt;/p&gt;</content:encoded>
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