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.
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Fixes

Solution

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Workaround

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History

Thu, 22 Oct 2026 06:45:00 +0000

Type Values Removed Values Added
Title Object Injection via Session Deserialization in Roundcube

Thu, 22 Oct 2026 02:00:00 +0000

Type Values Removed Values Added
Description 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.
First Time appeared Roundcube
Roundcube webmail
Weaknesses CWE-502
CPEs cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
Vendors & Products Roundcube
Roundcube webmail
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-10-22T01:48:23.338Z

Reserved: 2026-10-22T01:48:22.989Z

Link: CVE-2026-114724

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-22T02:17:00.343

Modified: 2026-10-22T02:17:00.343

Link: CVE-2026-114724

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-22T07:45:01Z

Weaknesses