CVE-2026-3395

The U.S. CISA has added two critical vulnerabilities in Joomla extensions iCagenda and Balbooa Forms to its Known Exploited Vulnerabilities catalog due to active zero-day exploitation. CVE-2026-48939 and CVE-2026-56291, both rated 10.0 CVSS, allow unauthenticated remote code execution via arbitrary file upload. These flaws are being exploited in automated attacks to deploy web shells on vulnerable Joomla sites. Australia's ACSC has also warned of a global campaign exploiting similar CMS vulnerabilities.

The Australian Cyber Security Centre (ACSC) has issued a warning about a global campaign targeting vulnerabilities in content management systems (CMS) and plugins, affecting numerous small- to medium-sized businesses in Australia. Threat actors are actively scanning for exposed CMS platforms and deploying webshells to gain persistent access, enabling credential theft, service disruption, and lateral movement. The campaign exploits known vulnerabilities across multiple CMS platforms including WordPress, Craft CMS, MaxSite CMS, MetInfo CMS, and Joomla JCE, with potential AI assistance to accelerate exploitation.