Email Security Recent RoundCube Webmail Vulnerability Exploited in Attacks Patched in December 2025, the exploited flaw leads to XSS attacks via the animate tags in SVG documents. By Ionut Arghire | February 23, 2026 (5:47 AM ET) Flipboard Reddit Whatsapp Whatsapp Email The US cybersecurity agency CISA on Friday warned of two RoundCube Webmail vulnerabilities being exploited in the wild. Prevalent within government and enterprise networks, RoundCube Webmail is a popular target for hackers, who have been observed exploiting flaws in the email client within days of public disclosure. This was the case in June last year with CVE-2025-49113 (CVSS score of 9.9), a post-authentication remote code execution (RCE) issue that was added to CISA’s Known Exploited Vulnerabilities (KEV) catalog on Friday. The critical bug was introduced over a decade ago and impacts all RoundCube versions 1.1.0 through 1.6.10, allowing attackers to include a payload in the name of files to be uploaded, leading to data being injected in the current session. The security defect was patched on June 1, 2025, and threat actors devised exploit code targeting it within days, claiming that credentials needed for successful exploitation could be brute forced. On Friday, CISA warned that, in addition to CVE-2025-49113, threat actors have been exploiting CVE-2025-68461 (CVSS score of 7.2), a high-severity RoundCube vulnerability patched in December 2025. Advertisement. Scroll to continue reading. The flaw, an XSS issue exploitable via the animate tag in an SVG document, was resolved in Webmail versions 1.6.12 and 1.5.12. The vulnerable RoundCube releases did not properly sanitize malicious payloads that could be embedded in the animate tag, allowing attackers to execute code in the context of the victim’s browser session without user interaction. CISA has urged federal agencies to patch both RoundCube vulnerabilities within three weeks, as mandated by Binding Operational Directive (BOD) 22-01. All organizations are advised to review CISA’s KEV catalog and prioritize addressing the security defects it contains. Related: BeyondTrust Vulnerability Exploited in Ransomware Attacks Related: Dell RecoverPoint Zero-Day Exploited by Chinese Cyberespionage Group Related: Google Patches First Actively Exploited Chrome Zero-Day of 2026 Related: CISA Warns of Exploited SolarWinds, Notepad++, Microsoft Vulnerabilities Written By Ionut Arghire Ionut Arghire is an international correspondent for SecurityWeek. 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