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    <lastBuildDate>Sun, 25 Oct 2026 17:35:05 +0000</lastBuildDate>
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      <title>CVE-2021-43776 — XSS vulnerability in @backstage/plugin-auth-backend</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-43776</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; backstage&lt;/p&gt;
&lt;p&gt;Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user&amp;#39;s browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; backstage&lt;/p&gt;
&lt;p&gt;Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user&amp;#39;s browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`.&lt;/p&gt;</content:encoded>
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