CVE-2026-11443CWE-79

Allegra downloadAttachment Cross-Site Scripting Authentication Bypass Vulnerability

Medium · published June 12, 2026

CVSS v3.0
4.6
EPSS
1%
Percentile
56.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.0
4.6 · MEDIUM
Vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00819 · 56.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-06-12T23:04Z
EPSS history
Timeline
  • 12 JUN 23:04Z
    Allegra downloadAttachment Cross-Site Scripting Authentication Bypass Vulnerability
    cvelistv5