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CVE details

CVE-2026-21881

Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below is vulnerable to a critical authentication bypass when REVERSE_PROXY_AUTH is enabled. The application blindly trusts HTTP headers for user authentication without verifying the request originated from a trusted reverse proxy. An attacker can impersonate any user, including administrators, by simply sending a spoofed HTTP header. This issue is fixed in version 1.2.49.

Score
9.1 critical
Published
2026-01-08
Links
NVD · cve.org

Affected ports (4)

PortPackageVersionStatusMaintainer
www/kanboardphp82-kanboard1.2.47_1unaddressedatanubiswas484@gmail.com
www/kanboardphp83-kanboard1.2.47_1unaddressedatanubiswas484@gmail.com
www/kanboardphp84-kanboard1.2.47_1unaddressedatanubiswas484@gmail.com
www/kanboardphp85-kanboard1.2.47_1unaddressedatanubiswas484@gmail.com

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>php82-kanboard</name>
	<range><lt>1.2.49</lt></range>
      </package>
      <package>
	<name>php83-kanboard</name>
	<range><lt>1.2.49</lt></range>
      </package>
      <package>
	<name>php84-kanboard</name>
	<range><lt>1.2.49</lt></range>
      </package>
      <package>
	<name>php85-kanboard</name>
	<range><lt>1.2.49</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>Kanboard is project management software focused on Kanban methodology.
	Versions 1.2.48 and below is vulnerable to a critical authentication
	bypass when REVERSE_PROXY_AUTH is enabled. The application blindly
	trusts HTTP headers for user authentication without verifying the
	request originated from a trusted reverse proxy. An attacker can
	impersonate any user, including administrators, by simply sending a
	spoofed HTTP header. This issue is fixed in version 1.2.49.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-21881</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-21881</url>
    </references>
    <dates>
      <discovery>2026-01-08</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>