Deserialization in Roundcube Webmail
CVE-2026-114724
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- bugs.debian.org/1151279 (issue-tracking, third-party-advisory)
- github.com/roundcube/roundcubemail/commit/93284f3f0e13f99af37fc3b81861e142eea8a… (patch)
- roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 (release-notes, vendor-advisory)
- github.com/roundcube/roundcubemail/releases/tag/1.7.5 (release-notes, patch)
- github.com/roundcube/roundcubemail/releases/tag/1.6.20 (release-notes, patch)
- github.com/roundcube/roundcubemail/commit/833770d3d3c35cfde74cc2614d368f25a75b6… (patch)
Frequently asked questions
- What is CVE-2026-114724?
- CVE-2026-114724 is a high-severity vulnerability in Roundcube Webmail, classified under Deserialization of Untrusted Data. CVSS score: 7.4/10. Published 2026-10-22.
- How severe is CVE-2026-114724?
- High severity. CVSS v3 base score is 7.4 out of 10.