CVE-2026-114724 Roundcube Webmail - Insecure Deserialization

Roundcube Webmail < 1.6.20 and 1.7.x < 1.7.5 contain a PHP object injection caused by improper handling of "!"-prefixed session keys in rcube_session::unserialize(), letting attackers influencing stored session data inject objects, exploit requires attacker control over session data.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.26% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Insecure Deserialization
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
22 October 2026
Updated
23 October 2026
Weakness
CWE-502

Vendor fix

Update to version 1.6.20, 1.7.5 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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