What’s Vulnerable › Vulnerabilities

CVE-2019-25368: OPNsense 19.1 Reflected XSS via diag_backup.php

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-15 · updated 2026-06-17
• Weakness: CWE-79

Description

OPNsense 19.1 contains multiple cross-site scripting vulnerabilities in the diag_backup.php endpoint that allow attackers to inject malicious scripts through multiple parameters including GDrive_GDriveEmail, GDrive_GDriveFolderID, GDrive_GDriveBackupCount, Nextcloud_url, Nextcloud_user, Nextcloud_password, Nextcloud_password_encryption, and Nextcloud_backupdir. Attackers can submit POST requests with script payloads in these parameters to execute arbitrary JavaScript in the context of authenticated administrator sessions.

Affected products

• OPNsense: 19.1

References

• https://forum.opnsense.org/index.php?topic=11469.0
• https://opnsense.org
• https://www.exploit-db.com/exploits/46351
• https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-diagbackupphp

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