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      <title>CVE-2026-55617 — Hydro: Insufficient session expiration when recreating sessions</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-55617</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; hydro-dev Hydro&lt;/p&gt;
&lt;p&gt;Hydro is a next-generation high-performance online judge platform. From 4.10.4 until 5.0.2, the session recreation logic in packages/hydrooj/src/service/layers/base.ts creates a replacement session token without deleting the previous token from the server-side session token store, so an old sid cookie can remain valid after logout or another renewal flow. An attacker who possesses a victim&amp;#39;s previously valid stale cookie can replay it over HTTP or HTTPS without knowing the victim&amp;#39;s username or password and without victim interaction at exploitation time. Successful replay can take over the victim&amp;#39;s account, disclose private data, and permit unauthorized modification or deletion of data available to that account. This issue is fixed in version 5.0.2.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; hydro-dev Hydro&lt;/p&gt;
&lt;p&gt;Hydro is a next-generation high-performance online judge platform. From 4.10.4 until 5.0.2, the session recreation logic in packages/hydrooj/src/service/layers/base.ts creates a replacement session token without deleting the previous token from the server-side session token store, so an old sid cookie can remain valid after logout or another renewal flow. An attacker who possesses a victim&amp;#39;s previously valid stale cookie can replay it over HTTP or HTTPS without knowing the victim&amp;#39;s username or password and without victim interaction at exploitation time. Successful replay can take over the victim&amp;#39;s account, disclose private data, and permit unauthorized modification or deletion of data available to that account. This issue is fixed in version 5.0.2.&lt;/p&gt;</content:encoded>
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