CVEs / CVE-2026-27944
CVE-2026-27944: 0xJacky nginx-ui vulnerability
- critical 9.8 CVSS 3.1 (from the CNA)
- EPSS 22.9% chance of exploitation in the next 30 days, higher than 97% of CVEs (30 Oct 2026)
- Last changed at its sources
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Description
Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.3, the /api/backup endpoint is accessible without authentication and discloses the encryption keys required to decrypt the backup in the X-Backup-Security response header. This allows an unauthenticated attacker to download a full system backup containing sensitive data (user credentials, session tokens, SSL private keys, Nginx configurations) and decrypt it immediately. This issue has been patched in version 2.3.3.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| 0xJacky nginx-ui | < 2.3.3 | — |
| Product | Affected | Fixed in |
|---|---|---|
| github.com/0xJacky/Nginx-UI (Go) | before 2.3.3 | 2.3.3 |
Package versions from GHSA-g9w5-qffc-6762.
Exploitation
Not in the CISA Known Exploited Vulnerabilities catalog as of 30 Oct 2026.
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-306, CWE-311 |
References
- CVE-2026-27944 on NVD
- CVE-2026-27944 on OSV
- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762 Exploit, Vendor Advisory
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
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