CVE-2026-107810 0xJacky CVE debrief

Who should care

Nginx UI administrators, security teams, and users with access to backup and restore functionality should assess exposure and apply patches or mitigations as needed. This includes reviewing and updating backup and restore procedures, verifying user access controls, and monitoring Nginx UI configuration and logs for suspicious activity. Additionally, affected operators and platform administrators should prioritize patching or mitigating this vulnerability.

Why it matters

CVE-2026-107810 is a high-severity vulnerability in Nginx UI that allows authenticated users to inject configuration or cause denial of service through crafted backups. Affected versions (2.0.0-2.4.0) require patching or mitigation to prevent exploitation.

• Potential persistent configuration injection
• Possible denial of service through modified configuration files
• Requires verification of backup and restore procedures
• Necessitates review of user access controls for backup functionality

Technical summary

Nginx UI 2.0.0-2.4.0 contains a vulnerability in the backup restore functionality. An authenticated user can craft a backup that creates a symlink in the staging tree, allowing injection of configuration or denial of service when modified files are consumed. The issue is caused by the internal/backup/restore.go file, which extracts inner archives before applying the restore_nginx and restore_nginx_ui flags. This can persistently inject configuration or cause denial of service when the modified files are later consumed. Fixed in version 2.5.0.

Defensive priority

High priority for Nginx UI administrators and security teams

Recommended defensive actions

• Review and apply vendor-provided patch (version 2.5.0) if using affected Nginx UI versions (2.0.0 - 2.4.0)
• Restrict backup restore access to trusted users and validate backup files before restoration
• Monitor Nginx UI configuration and logs for suspicious activity
• Verify backup and restore procedures to prevent unauthorized configuration changes
• Conduct a thorough review of user access controls for backup functionality
• Implement additional monitoring for potential configuration injection or denial of service
• Track and document changes to Nginx UI configuration and backup processes

Evidence notes

Official CVE Program record and NVD vulnerability detail page provide limited information on affected versions and exploitation. Vendor documentation and source code review are necessary for further verification.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.