CVE-2025-49113
RoundCube Webmail Deserialization of Untrusted Data Vulnerability
Roundcube Webmail
Roundcube Webmail before 1.5.10 and 1.6.x before 1.6.11 allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/actions/settings/upload.php, leading to PHP Object Deserialization.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 20 February 2026. US federal agencies were required to remediate it by 13 March 2026.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 99%, which is higher than 99.9% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Frequently asked questions
Is CVE-2025-49113 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2025-49113.
What does CVE-2025-49113 affect?
CVE-2025-49113 affects Roundcube Webmail. Roundcube Webmail before 1.5.10 and 1.6.x before 1.6.11 allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/actions/settings/upload.php, leading to PHP Object Deserialization.
How severe is CVE-2025-49113?
CVE-2025-49113 is rated CRITICAL with a CVSS base score of 9.9. EPSS puts the probability of exploitation in the next 30 days at 99%, higher than 99.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 13 March 2026.
How should organisations respond to CVE-2025-49113?
Apply the vendor patch for Roundcube Webmail as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.