Allegra downloadAttachment Cross-Site Scripting Authentication Bypass Vulnerability
CVE-2026-11443

4.6MEDIUM

Key Information:

Vendor

Allegra

Status
Allegra
Vendor
CVE Published:
12 June 2026

What is CVE-2026-11443?

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 Version(s)

Allegra 8.1.6.22

References

https://www.zerodayinitiative.com/advisories/ZDI-26-358/
x_research-advisory
https://alltena.com/en/resources/release-notes/release-no...
vendor-advisory

CVSS V3.0

Score:
4.6
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.