Understanding CVE-2022-26562: Critical Authentication Bug in Kopano Core and Zarafa Platforms

Welcome to our comprehensive analysis of a major security flaw identified as CVE-2022-26562 that affects Kopano Core and its predecessor, the Zarafa Collaboration Platform (ZCP). This critical bug, which has a severity score of 9.8, allows attackers to bypass authentication mechanisms, posing a significant risk to information security. Our aim is to provide you with an expert breakdown of the issue and guide you through understanding its potential impact and the necessary steps to mitigate this threat within your organization.

Background on Affected Software

Kopano Core serves as the backbone for the Kopano communication and collaboration suite, which includes email, calendaring, and file sharing capabilities, often used within enterprise environments to facilitate collaboration. Zarafa, now succeeded by Kopano, was similar in function and targeted towards providing a seamless groupware experience.

The bug in question is found specific to the component identified in Kopano Core versions up to v11.0.2.51 and Zarafa versions starting from 6.30. This issue was introduced between early release candidates and final releases of Zarafa, making it a longstanding vulnerability that has carried over into Kopano Core.

Details of CVE-2022-26562

This critical vulnerability resides in the authentication process managed by provider/libserver/ECKrbAuth.cpp in Kopano Core and provider/libserver/ECPamAuth.cpp in Zarafa. Essentially, it permits an attacker to authenticate with the systems using expired or even non-existent user credentials. This poses an enormous risk, as unauthorized access to these platforms can lead to data breaches, unauthorized data modification, and potential access to sensitive communications.

Implications of the Vulnerability

The exploitation of this vulnerability can allow attackers widespread access to organizational data and communications. For enterprises using these platforms, this could translate to significant risks involving confidentiality, integrity, and availability of critical information. Considering the widespread use of Kopano Core and Zarafa in business environments, the impact is potentially vast, affecting businesses of all sizes globally.

Mitigation and Recommendations

Given the severity of CVE-2022-26562, immediate action is recommended. Organizations should:

  • Upgrade to the latest version of Koploan Core, which addresses this vulnerability.
  • Implement stringent authentication controls and monitor logs for unusual access patterns.
  • Conduct regular security assessments to ensure no unauthorized access is granted through other potential vulnerabilities.

For users unable to upgrade immediately, implementing additional monitoring and control around the affected systems is advised until the patch can be applied.


Security vulnerabilities like CVE-2022-26562 underscore the critical need for ongoing vigilance and swift response in the digital landscape. By understanding the nature of the threat and taking proactive steps towards mitigation, organizations can protect themselves against potential breaches and sustain the integrity of their communication systems.

For more detailed information on patching and technical guidance, visit LinuxPatch, our dedicated patch management platform for Linux servers. Stay ahead of vulnerabilities by ensuring your systems are up to date and secure.