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THREAT OPSThreat News › ZDI-26-358: Allegra downloadAttachment Cross-Site Scripting Authentication Bypass Vulnerability

ZDI-26-358: Allegra downloadAttachment Cross-Site Scripting Authentication Bypass Vulnerability

lowzdi_publishedPublished 2026-06-11

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 ZDI has assigned a CVSS rating of 4.6. The following CVEs are assigned: CVE-2026-11443.

MITRE ATT&CK techniques

Indicators of compromise

Original source: http://www.zerodayinitiative.com/advisories/ZDI-26-358/