Allegra downloadAttachment Cross-Site Scripting Authentication Bypass Vulnerability

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Summary

CVECVE-2026-11443
StatePUBLISHED
Assignerzdi
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-13 00:16:24 UTC
Updated2026-06-13 00:16:24 UTC
DescriptionAllegra 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.

Risk And Classification

Primary CVSS: v3.0 4.6 MEDIUM from [email protected]

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

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

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary4.6MEDIUMCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
3.0CNACVSS4.6MEDIUMCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Allegra Allegra affected 8.1.6.22 Not specified

References

ReferenceSourceLinkTags
alltena.com/en/resources/release-notes/release-notes-for-release-9-0-0 [email protected] alltena.com
www.zerodayinitiative.com/advisories/ZDI-26-358 [email protected] www.zerodayinitiative.com
CVE Program record CVE.ORG www.cve.org canonical
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