CVE-2025-3486: RCE in Allegra 8.1.1.49

The successful exploitation of CVE-2025-3486 grants an attacker the ability to execute arbitrary code on the affected Allegra installation with LOCAL SERVICE privileges. This could lead to complete system compromise, data exfiltration, and further malicious activity. The attacker would need to authenticate first, but once authenticated, the lack of proper input validation in the isZipEntryValide method creates a directory traversal vulnerability, allowing them to manipulate file operations and execute commands. This vulnerability shares similarities with other directory traversal exploits where attackers leverage insufficient input sanitization to gain unauthorized access and control.

1. Reserved2025-04-09
2. Published2025-05-22
3. EPSS updated2026-03-23

The primary mitigation for CVE-2025-3486 is to upgrade Allegra to version 8.1.2 or later, which contains the necessary fix. If an immediate upgrade is not feasible, consider implementing strict access controls to limit who can interact with Allegra. Review and restrict file upload functionalities to prevent malicious ZIP files from being processed. While a WAF or proxy cannot directly prevent this vulnerability, it can be configured to monitor for suspicious file operations or unusual network traffic patterns associated with directory traversal attempts. After upgrading, confirm the fix by attempting to trigger the vulnerable isZipEntryValide method with a crafted ZIP file containing a malicious path; the operation should now fail with an appropriate error.