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Home/Vulnerability/CVE-2026-11443

CVE-2026-11443

Allegra downloadAttachment Cross-Site Scripting Authentication Bypass Vulnerability

Published: Jun 12, 2026Updated: Jun 12, 2026 Sources: CVE List
NVD MITRE
4.6CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None

Weaknesses

CWE-79CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Allegra
Allegra

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

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

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