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      <title>CVE-2025-54812 — Apache Log4cxx: Improper HTML escaping in HTMLLayout</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2025-54812</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache Log4cxx&lt;/p&gt;
&lt;p&gt;Improper Output Neutralization for Logs vulnerability in Apache Log4cxx.&lt;/p&gt;
&lt;p&gt;When using HTMLLayout, logger names are not properly escaped when writing out to the HTML file.
If untrusted data is used to retrieve the name of a logger, an attacker could theoretically inject HTML or Javascript in order to hide information from logs or steal data from the user.
In order to activate this, the following sequence must occur:&lt;/p&gt;
&lt;p&gt;*  Log4cxx is configured to use HTMLLayout.&lt;/p&gt;
&lt;p&gt;*  Logger name comes from an untrusted string&lt;/p&gt;
&lt;p&gt;*  Logger with compromised name logs a message&lt;/p&gt;
&lt;p&gt;*  User opens the generated HTML log file in their browser, leading to potential XSS&lt;/p&gt;
&lt;p&gt;Because logger names are generally constant strings, we assess the impact to users as LOW&lt;/p&gt;
&lt;p&gt;This issue affects Apache Log4cxx: before 1.5.0.&lt;/p&gt;
&lt;p&gt;Users are recommended to upgrade to version 1.5.0, which fixes the issue.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache Log4cxx&lt;/p&gt;
&lt;p&gt;Improper Output Neutralization for Logs vulnerability in Apache Log4cxx.&lt;/p&gt;
&lt;p&gt;When using HTMLLayout, logger names are not properly escaped when writing out to the HTML file.
If untrusted data is used to retrieve the name of a logger, an attacker could theoretically inject HTML or Javascript in order to hide information from logs or steal data from the user.
In order to activate this, the following sequence must occur:&lt;/p&gt;
&lt;p&gt;*  Log4cxx is configured to use HTMLLayout.&lt;/p&gt;
&lt;p&gt;*  Logger name comes from an untrusted string&lt;/p&gt;
&lt;p&gt;*  Logger with compromised name logs a message&lt;/p&gt;
&lt;p&gt;*  User opens the generated HTML log file in their browser, leading to potential XSS&lt;/p&gt;
&lt;p&gt;Because logger names are generally constant strings, we assess the impact to users as LOW&lt;/p&gt;
&lt;p&gt;This issue affects Apache Log4cxx: before 1.5.0.&lt;/p&gt;
&lt;p&gt;Users are recommended to upgrade to version 1.5.0, which fixes the issue.&lt;/p&gt;</content:encoded>
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