Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 contains an object injection primitive in rcube_session::unserialize(). A session key prefixed with “!” was treated as having no value, and the reconstructed serialized string was emitted with a key but no corresponding value, desynchronizing the remainder of the input so that following session data was interpreted as a serialized value. This yields a PHP object injection primitive for an attacker able to influence stored session data. Upstream fixed this in the commit “Fix object injection primitive in rcube_session::unserialize() via “!”-prefixed session keys”, which rejects such keys.
CVE-2026-114724
CVSS base score
7.4 (v3.1)
Severity
HIGH
Attack vector
Local
Weakness
CWE-502
Last modified
October 29, 2026
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
roundcube webmail
References
- bugs.debian.org Third Party Advisory, Mailing List
- github.com Patch
- github.com Patch
- github.com Release Notes
- github.com Release Notes
- roundcube.net Issue Tracking