An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 8
https://github.com/roundcube/roundcubemail/commit/618c5428edc69fb088e7ac6c89e50…
cve@mitre.org
https://github.com/roundcube/roundcubemail/commit/6d586cfa4d8a31f7957f7a445aaed…
cve@mitre.org
https://github.com/roundcube/roundcubemail/commit/a4ead994d2f0ea92e4a1603196a19…
cve@mitre.org
https://github.com/roundcube/roundcubemail/releases/tag/1.5.14
cve@mitre.org
https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
cve@mitre.org
https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
cve@mitre.org
https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14
cve@mitre.org
http://www.openwall.com/lists/oss-security/2026/04/11/6
af854a3a-2127-422b-91ae-364da2661108