CVE-2026-11443: Allegra

Medium severity, CVSS 4.6. EPSS: 0.8% chance of exploitation in the next 30 days.

Allegra downloadAttachment Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to execute arbitrary script on affected installations of Allegra. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the downloadAttachment method. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of arbitrary script. An attacker can leverage this vulnerability to execute script in the context of the current user. Was ZDI-CAN-28236.

Affected products

• Allegra Allegra: version 8.1.6.22 only

Published 2026-06-13. Last modified 2026-07-23.