CVE-2026-11443

Deferred Deferred - Pending Action

Cross-Site Scripting in Allegra downloadAttachment

Publication date: 2026-06-13

Last updated on: 2026-06-15

Assigner: Zero Day Initiative

Description

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-06-13

Last Modified

2026-06-15

Generated

2026-07-03

AI Q&A

2026-06-13

EPSS Evaluated

2026-07-02

NVD

CVE-2026-11443

EUVD

EUVD-2026-36634

Affected Vendors & Products

Vendor	Product	Version / Range
allegra	allegra	9.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

CVE-2026-11443 is a Cross-Site Scripting (XSS) and Authentication Bypass vulnerability affecting Allegra software. It exists in the downloadAttachment method due to insufficient validation of user-supplied data. This flaw allows remote attackers to inject and execute arbitrary scripts in the context of the current user.

Exploitation requires user interaction, such as the target visiting a malicious page or opening a malicious file.

Impact Analysis

This vulnerability can allow an attacker to execute arbitrary scripts within the context of the affected user's session. This can lead to unauthorized actions being performed on behalf of the user, potentially compromising sensitive information or allowing further attacks such as session hijacking or data theft.

Since exploitation requires user interaction, the risk depends on users being tricked into visiting malicious pages or opening malicious files.

Mitigation Strategies

To mitigate the CVE-2026-11443 vulnerability, it is recommended to update Allegra software to version 9.0.0 or later, as this update addresses the issue in the downloadAttachment method.

Additionally, users should be cautious about interacting with untrusted web pages or opening suspicious files, since exploitation requires user interaction.

Compliance Impact

The provided information does not specify how the CVE-2026-11443 vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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