Allegra downloadAttachment Cross-Site Scripting Authentication Bypass Vulnerability
Vulnerability Details
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.
Additional Details
Allegra has issued an update to correct this vulnerability. More details can be found at:
https://alltena.com/en/resources/release-notes/release-notes-for-release-9-0-0/
Disclosure Timeline
- 2025-10-08 - Vulnerability reported to vendor
- 2026-06-11 - Coordinated public release of advisory
- 2026-06-11 - Advisory Updated
Credit
Bobby Gould (@bobbygould5) of Trend Zero Day Initiative
