Final remediation deadline for critical Roundcube Webmail RCE today. 🔓
Remediation Alert · @[CISA](urn:li:organization:13010360) KEV deadline for CVE-2025-49113 (Severity 9.9).
Today marks the final deadline for federal agencies to remediate the critical deserialization flaw in Roundcube Webmail software. This vulnerability, which had been hidden in the codebase for over 10 years, allows an authenticated attacker to execute arbitrary system-level commands without validation.
Nation-state groups, including APT28 and Winter Vivern, have been observed weaponizing multiple Roundcube flaws for cyberespionage. Because webmail is a primary entry point for corporate data, an unpatched server allows for the silent exfiltration of entire executive communication histories.
The uncomfortable truth: If your webmail interface is unpatched today, you should assume that your internal executive data is already being harvested by an automated botnet.
→ Update Roundcube Webmail to the latest stable release (1.6.11+) immediately.
→ Conduct a deep forensic audit of your mail server logs for unauthorized PHP object deserialization attempts.
→ Implement strict network segmentation to ensure mail servers cannot communicate with internal database segments.
Have you confirmed that every legacy webmail instance in your environment has been patched or decommissioned? 👇
#Cybersecurity #EmailSecurity #ZeroTrust #VulnerabilityManagement #SOC #CodeDefence