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.

CVSS v3 4.6 MEDIUM

4.6^/10

CVSS v3 : MEDIUM

Vector : AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Exploitability : 2.1 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://alltena.com/en/resources/release-notes/release-notes-for-release-9-0-0/
https://www.zerodayinitiative.com/advisories/ZDI-26-358/

Configurations

No configuration.

History

23 Jul 2026, 09:10

Type	Values Removed	Values Added
Summary		(es) Vulnerabilidad de omisión de autenticación por cross-site scripting en Allegra downloadAttachment. Esta vulnerabilidad permite a atacantes remotos ejecutar script arbitrario en instalaciones afectadas de Allegra. Se requiere interacción del usuario para explotar esta vulnerabilidad, ya que el objetivo debe visitar una página maliciosa o abrir un archivo malicioso. La falla específica existe dentro del método downloadAttachment. El problema resulta de la falta de validación adecuada de los datos proporcionados por el usuario, lo que puede llevar a la inyección de script arbitrario. Un atacante puede aprovechar esta vulnerabilidad para ejecutar script en el contexto del usuario actual. Fue ZDI-CAN-28236.

13 Jun 2026, 00:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-13 00:16

Updated : 2026-07-23 09:10

NVD link : CVE-2026-11443

Mitre link : CVE-2026-11443

CVE.ORG link : CVE-2026-11443

JSON object : View

Products Affected

No product.

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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