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CVE-2026-27944

Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure

Published: Mar 5, 2026Updated: Mar 5, 2026 Sources: CVE List NVD GHSA BDUCWE-306
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
22.2%
Top 2.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
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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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-306CWE-311

Affected Products

github.com/0xJacky/Nginx-UIGoOSS Libraries
nginx-ui0xJacky
Mixed
Cloud & SaaS / saas-application
Nginx UIСообщество свободного программного обеспечения
On-prem
Web & CMS Plugins
gopackage-ecosystemOSS Libraries
0xjackyindividual-devCloud & SaaSaka nginx-ui
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques
Collection
Initial Access
View detailed technique mapping

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-27944
nvd.nist.gov
https://csrc.nist.gov/publications/detail/sp/800-57-part-1/rev-5/final
csrc.nist.gov
and 3 more references View all →

Timeline

Published
Mar 5, 2026
Last Updated
Mar 5, 2026

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