{"uuid": "e1af6c53-cdbd-4345-9bf6-c1f9750dc13a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-48939", "type": "seen", "source": "https://gist.github.com/alon710/1e41cbc3b54c1c25a3d44fc7a523b70b", "content": "# CVE-2026-48939: CVE-2026-48939: Unauthenticated Remote Code Execution in Joomla iCagenda Extension\n\n> **CVSS Score:** 10.0\n> **Published:** 2026-06-20\n> **Full Report:** https://cvereports.com/reports/CVE-2026-48939\n\n## Summary\nCVE-2026-48939 is a critical vulnerability in the iCagenda events calendar extension for Joomla that allows unauthenticated remote attackers to execute arbitrary code via unrestricted file uploads. The flaw stems from a lack of server-side validation of file uploads and missing authorization checks at the controller level. Successful exploitation results in complete compromise of the affected web application host.\n\n## TL;DR\nUnauthenticated arbitrary file upload in iCagenda allows remote code execution via direct POST requests to controller endpoints.\n\n## Exploit Status: ACTIVE\n\n## Technical Details\n\n- **CWE ID**: CWE-434, CWE-284\n- **Attack Vector**: Network\n- **CVSS Score**: 10.0 (Critical)\n- **Exploit Status**: Active exploitation in the wild\n- **CISA KEV Status**: Listed on July 10, 2026\n\n## Affected Systems\n\n- Joomla instances running iCagenda 3.2.1 through 3.9.14\n- Joomla instances running iCagenda 4.0.0 through 4.0.7\n- **iCagenda**: >= 3.2.1, < 3.9.15 (Fixed in: `3.9.15`)\n- **iCagenda**: >= 4.0.0, < 4.0.8 (Fixed in: `4.0.8`)\n\n## Mitigation\n\n- Upgrade iCagenda extension to version 4.0.8 (for Joomla 4.x/5.x/6.x) or 3.9.15 (for legacy Joomla 3.x)\n- Configure web server rules to deny script execution inside the /images/ directory\n- Temporarily rename or delete the com_icagenda directories if patching is delayed\n\n**Remediation Steps:**\n1. Navigate to Joomla administrator panel and check the version of the iCagenda component.\n2. Download the patched package (4.0.8 or 3.9.15) from the official iCagenda website.\n3. Install the update via the Joomla Extension Manager to replace vulnerable files.\n4. Verify the directory /images/icagenda/frontend/attachments/ for any suspicious PHP files.\n5. Implement server-level execution blockings using Apache .htaccess or Nginx configuration blocks.\n\n## References\n\n- [mySites.guru Zero-Day Advisory](https://mysites.guru/blog/icagenda-zero-day-file-upload-rce/)\n- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48939)\n- [National Vulnerability Database (NVD) CVE Entry](https://nvd.nist.gov/vuln/detail/CVE-2026-48939)\n- [CVE Org Authority Entry](https://www.cve.org/CVERecord?id=CVE-2026-48939)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/CVE-2026-48939) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-07-16T07:01:40.210426Z"}