Deserialization of Untrusted Data in Roundcube Webmail - #VU124136
Published: March 19, 2026
Vulnerability identifier: #VU124136
CSH Severity: Critical
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Red
CVE-ID: N/A
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Roundcube
Affected software:
Roundcube Webmail
Roundcube Webmail
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code or write arbitrary files.
The vulnerability exists due to unsafe deserialization in redis/memcache session handler when processing session data. A remote attacker can send a specially crafted session payload to execute arbitrary code or write arbitrary files.
No authentication is required to exploit this vulnerability.
Remediation
Install security update from vendor's website.