Roundcube Webmail is a widely used webmail service provider accessed by millions around the globe. Known for its efficiency and user-friendliness, it is predominantly utilized by organizations and educational institutions to facilitate communication. The software can be hosted on a variety of platforms, enhancing its adaptability to different environments. It serves to provide a robust email management system allowing users to manage their mail, address books, and even calendar functions. Its open-source nature makes it a favorite among developers looking to customize their user interface. The software's capability to integrate various plugins increases its flexibility for personalized mailing experiences.
The scanned vulnerability is a Remote Code Execution (RCE) flaw prevalent in certain versions of the Roundcube Webmail. This exploit arises due to improper validation of the _from parameter in the settings upload action endpoint of the application. Authenticated users can perform PHP Object Deserialization which could further result in the execution of arbitrary code on the server. The affected versions include any editions prior to 1.5.10 and versions between 1.6.0 and 1.6.11, necessitating caution for systems running these iterations. This vulnerability poses a noteworthy risk given the criticality score attached to its occurrence. Mitigation would involve updating to the latest secure releases and employing security configurations that block unauthorized manipulations.
Remote Code Execution in Roundcube is facilitated via a vulnerability in the program/actions/settings/upload.php file, primarily affecting infernal and external operatives. In technical terms, this flaw is rooted in improper handling and validation of elements within user-uploaded parameters that could lead to object injection. The exploitation process involves authenticated users sending a crafted request to execute commands on the server under the guise of a legitimate transaction. Exploiters would generally manipulate the _from parameter to achieve unintended code execution. The template checks for certain variables such as rcversion and oast to ascertain if a system is vulnerable. Users validating these exploit attempts must ensure all communication with the server is monitored and audited.
Potential repercussions from this vulnerability, if left unaddressed, include unauthorized access to sensitive information stored on the server. Attackers exploiting this flaw might obtain control over the server system, leading to data breaches, unauthorized data manipulation, and service downtime. Moreover, the exploit can act as a conduit for further injections or serve as a foothold for launching more complex attack vectors. This could also involve network-wide compromises, leading to extensive damage across an organization's infrastructure. It is crucial to regularly update and run patches on webmail systems to mitigate potential threats.
REFERENCES
- https://nvd.nist.gov/vuln/detail/CVE-2025-49113
- https://fearsoff.org/research/roundcube
- https://github.com/advisories/GHSA-8j8w-wwqc-x596
- http://www.openwall.com/lists/oss-security/2025/06/02/3
- https://roundcube.net/news/2025/06/01/security-updates-1.6.11-and-1.5.10
- https://github.com/roundcube/roundcubemail/commit/0376f69e958a8fef7f6f09e352c541b4e7729c4d
- https://github.com/roundcube/roundcubemail/commit/7408f31379666124a39f9cb1018f62bc5e2dc695
- https://github.com/roundcube/roundcubemail/commit/c50a07d88ca38f018a0f4a0b008e9a1deb32637e
- Update Roundcube Webmail to version 1.5.10 or 1.6.11 or later.
- Implement network-level filtering to monitor unusual traffic patterns to and from the application.
- Regularly review and validate the system logs to detect unauthorized access attempts.
- Employ host-based intrusion detection systems for early detection of exploitation attempts.
- Conduct frequent security assessments and code reviews for any third-party plugins or extensions.
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