CISA KEV Adds Roundcube Vulnerabilities

Organizations deploying Roundcube Webmail face heightened risks from Roundcube KEV vulnerabilities now listed in CISA’s Known Exploited Vulnerabilities Catalog. Evidence of real-world attacks prompted addition of CVE-2025-49113 deserialization and CVE-2025-68461 XSS flaws, common vectors for cyber operations. Federal Civilian Executive Branch agencies must patch per BOD 22-01 timelines, while private entities prioritize to safeguard email infrastructure integrity.

Roundcube KEV Vulnerabilities Overview

CISA maintains the KEV Catalog as a prioritized inventory of CVEs posing substantial threats, stemming from BOD 22-01 issued to curb exploitable weaknesses in federal networks. The directive compels FCEB entities to address listed flaws by designated deadlines, fortifying defenses against persistent actors. Deserialization and XSS defects in Roundcube enable unauthorized access or payload execution, compromising confidentiality across mail servers.

Private sector adoption of KEV prioritization mitigates similar exposures in hybrid environments.

CVE-2025-49113 Deserialization Flaw

The table below details the newly added Roundcube KEV vulnerabilities.

This table captures CISA-designated flaws confirmed under active exploitation.

CVE-2025-49113 permits deserialization of untrusted inputs, potentially yielding remote code execution when crafted payloads process through Roundcube’s handling routines. Attackers target session data or attachments to trigger memory corruption, evading input validation. Webmail deployments with unpatched instances risk full server compromise, disrupting email availability for enterprises reliant on open-source solutions.

CVE-2025-68461 XSS Exploitation

CVE-2025-68461 facilitates cross-site scripting via inadequate sanitization, injecting scripts into user sessions or views. Malicious links or forms deliver payloads executing in victim browsers, harvesting credentials or session tokens. This persists across updates lacking specific fixes, undermining client-side confidentiality in shared mail environments.

Roundcube KEV vulnerabilities exemplify email platform risks amplified by widespread adoption.

BOD 22-01 Remediation Mandates

FCEB agencies adhere to strict timelines for KEV entries, integrating scans into continuous monitoring workflows. CISA extends urgency to all organizations, advocating vulnerability management centered on exploited flaws over theoretical scores. Non-compliance exposes networks to campaigns leveraging these vectors for initial access or lateral movement.

Integration with asset inventories ensures timely deployment of vendor patches, preserving operational continuity.

Implications for Enterprise Email Security

Webmail systems like Roundcube underpin communication for SMEs and large entities, where deserialization flaws grant deep access and XSS enables phishing escalation. Active exploitation signals sophisticated actors chaining these for persistence, data exfiltration, or ransomware staging. Organizations audit exposures via SBOMs, prioritizing KEV alignment in patch cadences.

Availability suffers during breach responses, while integrity falters under manipulated sessions. CISA KEV updates demand proactive scanning beyond federal scopes.

Roundcube KEV vulnerabilities heighten compromise potential in email gateways, jeopardizing data confidentiality and service uptime through code injection and scripting. BOD 22-01 timelines guide FCEB remediation, with CISA advisories urging universal patching. Vendor updates and configuration hardening restore security postures against documented threats.