PatchSiren cyber security CVE debrief
CVE-2026-11443 Allegra CVE debrief
CVE-2026-11443 is a Cross-Site Scripting (XSS) Authentication Bypass Vulnerability in the Allegra software. The vulnerability exists within the downloadAttachment method and results from the lack of proper validation of user-supplied data. This allows remote attackers to execute arbitrary script on affected installations of Allegra. User interaction is required to exploit this vulnerability, as the target must visit a malicious page or open a malicious file. An attacker can leverage this vulnerability to execute script in the context of the current user.
- Vendor
- Allegra
- Product
- Unknown
- CVSS
- MEDIUM 4.6
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-13
- Original CVE updated
- 2026-06-13
- Advisory published
- 2026-06-13
- Advisory updated
- 2026-06-13
Who should care
Users of Allegra software should be aware of this vulnerability and take necessary precautions to prevent exploitation.
Technical summary
The vulnerability has a CVSS score of 4.6 and a severity of MEDIUM. It was published on June 13, 2026, and has not been modified since then. The CVE record can be found at [cve-org]. More details about the vulnerability can be found at [nvd].
Defensive priority
MEDIUM
Recommended defensive actions
- Apply patches or updates provided by the vendor to fix the vulnerability.
- Restrict access to the affected installations to prevent unauthorized exploitation.
- Educate users about the risks of visiting malicious pages or opening malicious files.
Evidence notes
The vendor of the affected software is currently listed as Unknown Vendor. However, there is evidence suggesting the vendor might be Alltena. The vulnerability was reported by ZDI-CAN-28236.
Official resources
public