RoundCube Webmail Deserialization of Untrusted Data Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 20/02/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| roundcube/roundcubemail | ≥ 1.6.0, < 1.6.11< 1.5.10 | 1.6.111.5.10 |
| webmail | ≥ 1.6.0, < 1.6.11< 1.5.10 | 1.6.111.5.10 |
Roundcube Webmail before 1.5.10 and 1.6.x before 1.6.11 allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/actions/settings/upload.php, leading to PHP Object Deserialization.
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