Description
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.
Affected products
roundcube: webmail
References8
- github.com/roundcube/roundcubemail/commit/618c5428edc69fb088e7a… Patch
- github.com/roundcube/roundcubemail/commit/6d586cfa4d8a31f7957f7… Patch
- github.com/roundcube/roundcubemail/commit/a4ead994d2f0ea92e4a16… Patch
- github.com/roundcube/roundcubemail/releases/tag/1.5.14 Release Notes
- github.com/roundcube/roundcubemail/releases/tag/1.6.14 Release Notes
- github.com/roundcube/roundcubemail/releases/tag/1.7-rc5 Release Notes
- roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1… Third Party Advisory
- www.openwall.com/lists/oss-security/2026/04/11/6 Issue TrackingMailing List
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - EPSS — exploit probability
- 0% percentile: 42 · as of 12 November 2026
- CWE
- CWE-502
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.