CVE-2026-27944 in the critical feed json
Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
published 2026-03-05 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-9847 , GHSA-g9w5-qffc-6762 , GO-2026-4614
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 22.8%
- EPSS 22.8% chance of exploitation in 30 days, percentile 97%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
- go github.com/0xJacky/Nginx-UI 2.3.3
- nginxui nginx_ui 2.3.3
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260317T205859-150000.1.152.1
suse advisories SUSE-SU-2026:1042-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
22.84% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template Nginx UI < 2.3.3 - Information Disclosure nuclei detection template
- github.com https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/0xJacky/Nginx-UI | <2.3.3 all versions |
2.3.3 |
Affected products
- 0xJacky nginx-ui
Classification
References
-
github.com
/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762
web, exploit, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-27944
advisory
-
csrc.nist.gov
/publications/detail/sp/800-57-part-1/rev-5/final
web
-
github.com
/0xJacky/nginx-ui
package
-
owasp.org
/www-project-top-ten/2017/A2_2017-Broken_Authentication
web
-
owasp.org
/www-project-top-ten/2017/A3_2017-Sensitive_Data_Exposure
web
Sources
- CVE List CVE-2026-27944
- GitHub Advisory GHSA-g9w5-qffc-6762
- NVD CVE-2026-27944
- OSV GO-2026-4614
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.