Alert - Vulnerability impacting Roundcube Webmail – CVE-2025-49113

Number: AL25-007
Date: June 11, 2025

Audience

This Alert is intended for IT professionals and managers of notified organizations.

Purpose

An Alert is used to raise awareness of a recently identified cyber threat Cyber threatA threat actor, using the internet, who takes advantage of a known vulnerability in a product for the purposes of exploiting a network and the information the network carries. that may impact cyber information assets, and to provide additional detection DetectionThe monitoring and analyzing of system events in order to identify unauthorized attempts to access system resources. and mitigation advice to recipients. The Canadian Centre for Cyber Security Cyber securityThe protection of digital information, as well as the integrity of the infrastructure housing and transmitting digital information. More specifically, cyber security includes the body of technologies, processes, practices and response and mitigation measures designed to protect networks, computers, programs and data from attack, damage or unauthorized access so as to ensure confidentiality, integrity and availability. ("Cyber Centre") is also available to provide additional assistance regarding the content of this Alert to recipients as requested.

Details

On June 1, 2025, Roundcube released a security bulletin for a critical vulnerability VulnerabilityA flaw or weakness in the design or implementation of an information system or its environment that could be exploited to adversely affect an organization's assets or operations. affecting Webmail. The issue is described as a Post-Auth RCE via PHP Object Deserialization vulnerability (CVE-2025-49113)Footnote 1. The versions of Roundcube products affected areFootnote 2:

  • Webmail – versions prior to 1.5.10
  • Webmail – versions prior to 1.6.11

In response to this vulnerability, the Cyber Centre released AV25-309 on June 2, 2025Footnote 3.

While the Cyber Centre has not received any reports of exploitation, the existence of a proof of concept (POC) significantly raises the likeness of abuse by malicious actors. The existence of a published POC makes it imperative to take action to assess and mitigate this vulnerability.

The Cyber Centre is aware that exploitation of CVE-2024-42009 has been used to obtain valid credentials, which could lead to exploitation of CVE-2025-49113. CISA added CVE-2024-42009 to their Known Exploited Vulnerabilities (KEV) catalogFootnote 4Footnote 5on June 9, 2025.

Suggested actions

The Cyber Centre strongly recommends that organizations update to Roundcube Webmail versions 1.5.10+ or 1.6.11+Footnote 2, which would mitigate issues reported by both CVEs mentioned here (CVE-2024-42009 and CVE-2025-49113).

The Cyber Centre recommends that organizations:

  • Assess the installation of Roundcube Webmail.
  • Apply updates to Roundcube Webmail without delay.
  • Monitor affected systems for signs of exploitation.
  • Monitor for brute-force attempts and if possible, implement rate limitation techniques.

In addition, the Cyber Centre strongly recommends that organizations review and implement the Cyber Centre’s Top 10 IT Security ActionsFootnote 6 with an emphasis on the following strategies:

If activity matching the content of this alert is discovered, recipients are encouraged to report via the My Cyber Portal, or email contact@cyber.gc.ca.

References

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