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A critical security vulnerability, CVE-2025-49113, has been identified in Roundcube webmail, a popular skinnable AJAX based webmail solution for IMAP servers. The flaw allows for remote code execution (RCE) through the exploitation of email subject lines. Attackers can inject malicious PHP code into the subject header field, which, when processed by Roundcube, allows them to execute arbitrary commands on the server. This vulnerability is particularly dangerous as it can be exploited without any user interaction, enabling attackers to compromise systems simply by sending a malicious email.
This vulnerability affects Roundcube versions up to 1.6.4. Security researchers confirmed that the flaw was actively exploited to install backdoors and exfiltrate system information. As of June 2025, the Shadowserver Foundation reported that over 84,925 Roundcube instances were exposed to this vulnerability. Criminal IP Asset Search has also identified tens of thousands of affected cases, highlighting the widespread nature of the threat. The vulnerability was patched in version 1.6.5.
Ubuntu has released security notices (USN-7584-1) addressing the Roundcube vulnerability. It was discovered that Roundcube Webmail did not properly sanitize the _from parameter in a URL, leading to PHP Object Deserialization. A remote attacker could possibly use this issue to execute arbitrary code. The problem can be corrected by updating your system to the specified package versions for your Ubuntu release, which is available via standard system updates or Ubuntu Pro with ESM Apps. Given the severity and active exploitation of CVE-2025-49113, users are strongly advised to update their Roundcube installations immediately to the latest version.
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References :
This vulnerability affects Roundcube versions up to 1.6.4. Security researchers confirmed that the flaw was actively exploited to install backdoors and exfiltrate system information. As of June 2025, the Shadowserver Foundation reported that over 84,925 Roundcube instances were exposed to this vulnerability. Criminal IP Asset Search has also identified tens of thousands of affected cases, highlighting the widespread nature of the threat. The vulnerability was patched in version 1.6.5.
Ubuntu has released security notices (USN-7584-1) addressing the Roundcube vulnerability. It was discovered that Roundcube Webmail did not properly sanitize the _from parameter in a URL, leading to PHP Object Deserialization. A remote attacker could possibly use this issue to execute arbitrary code. The problem can be corrected by updating your system to the specified package versions for your Ubuntu release, which is available via standard system updates or Ubuntu Pro with ESM Apps. Given the severity and active exploitation of CVE-2025-49113, users are strongly advised to update their Roundcube installations immediately to the latest version.
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References :
- CIP Blog: This article details the CVE-2025-49113 vulnerability affecting Roundcube webmail.
- Ubuntu security notices: This article details the CVE-2025-49113 vulnerability, emphasizing its active exploitation and the importance of immediate patching.
Classification:
- HashTags: #Roundcube #RCE #CVE202549113
- Company: Roundcube
- Target: Roundcube users
- Product: Roundcube Webmail
- Feature: Email subject lines
- Type: Vulnerability
- Severity: Critical