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CVE-2026-11443: Allegra downloadAttachment Cross-Site Scripting Authentication Bypass Vulnerability

• Severity: medium (CVSS 4.6 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-13 · updated 2026-07-23
• Weakness: CWE-79

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.

Affected products

• Allegra: 8.1.6.22

References

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

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