Risk Letters

Exploited vulnerability

CVE-2025-49113

TLP:CLEAR

RoundCube Webmail Deserialization of Untrusted Data Vulnerability

RoundCube Webmail contains a deserialization of untrusted data vulnerability that allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/actions/settings/upload.php.

Facts

  • Vendor: Roundcube
  • Product: Webmail
  • CVSS: 9.9
  • EPSS (probability of exploitation within 30 days): 99.5 %
  • On CISA's Known Exploited Vulnerabilities list since: 20 February 2026
  • First known exploitation: 20 February 2026
  • CISA's deadline for US federal agencies: 13 March 2026
  • Weakness: CWE-502
  • First seen by Risk Letters: 20 February 2026

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Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD