Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 17.5%
CVSS Severity
CVSS v3 Score 7.4
References
- https://bugs.debian.org/1151279
- https://github.com/roundcube/roundcubemail/commit/833770d3d3c35cfde74cc2614d368f25a75b6f99
- https://github.com/roundcube/roundcubemail/commit/93284f3f0e13f99af37fc3b81861e142eea8a922
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5
- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5
Products affected by CVE-2026-114724
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cpe:2.3:a:roundcube:webmail:1.6.0
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cpe:2.3:a:roundcube:webmail:1.6.1
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cpe:2.3:a:roundcube:webmail:1.6.10
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cpe:2.3:a:roundcube:webmail:1.6.11
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cpe:2.3:a:roundcube:webmail:1.6.12
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cpe:2.3:a:roundcube:webmail:1.6.13
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cpe:2.3:a:roundcube:webmail:1.6.14
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cpe:2.3:a:roundcube:webmail:1.6.15
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cpe:2.3:a:roundcube:webmail:1.6.16
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cpe:2.3:a:roundcube:webmail:1.6.17
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cpe:2.3:a:roundcube:webmail:1.6.18
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cpe:2.3:a:roundcube:webmail:1.6.19
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cpe:2.3:a:roundcube:webmail:1.6.2
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cpe:2.3:a:roundcube:webmail:1.6.3
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cpe:2.3:a:roundcube:webmail:1.6.4
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cpe:2.3:a:roundcube:webmail:1.6.5
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cpe:2.3:a:roundcube:webmail:1.6.6
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cpe:2.3:a:roundcube:webmail:1.6.7
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cpe:2.3:a:roundcube:webmail:1.6.8
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cpe:2.3:a:roundcube:webmail:1.6.9
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cpe:2.3:a:roundcube:webmail:1.7.0
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cpe:2.3:a:roundcube:webmail:1.7.1
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cpe:2.3:a:roundcube:webmail:1.7.2
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cpe:2.3:a:roundcube:webmail:1.7.3
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cpe:2.3:a:roundcube:webmail:1.7.4