Cyber Resilience

CVE-2026-33026

Nginxui Nginx Ui ≤ 2.3.4

Public PoC
Published
30 March 2026
Modified
01 April 2026
Patch / advisory
View advisory
CVSS Score v4 9.4
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0033 25th percentile
Risk Priority 31 floored blend · peak EPSS

Summary

CVE-2026-33026 is a critical-severity Cleartext Storage of Sensitive Information (CWE-312) vulnerability in Nginxui Nginx Ui. Its CVSS base score is 9.4 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Supply Chain Compromise (T1195); ranked at the 25th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to SC-13 (Cryptographic Protection) and SC-28 (Protection of Information at Rest) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2026-33026 affects Nginx UI, a web user interface for the Nginx web server, in versions prior to 2.3.4. The vulnerability resides in the backup restore mechanism, which permits attackers to tamper with encrypted backup archives and inject malicious configuration during the restoration process. This flaw is associated with CWEs 312 (Cleartext Storage of Sensitive Information), 347 (Improper Verification of Cryptographic Signature), and 354 (Incorrect Conversion between Representations), and carries a CVSS v3.1 base score of 9.1.

Exploitation requires high privileges (PR:H), such as administrative access to the Nginx UI, and can be performed over the network (AV:N) with low complexity (AC:L) and no user interaction (UI:N). Successful attacks alter encrypted backups to inject malicious Nginx configurations upon restoration, resulting in high impacts across confidentiality, integrity, and availability (C:H/I:H/A:H) with changed scope (S:C), potentially leading to full system compromise.

The issue has been addressed in Nginx UI version 2.3.4, as detailed in the project's GitHub release notes and security advisory (GHSA-fhh2-gg7w-gwpq). Security practitioners should upgrade to the patched version to mitigate the risk and review any restored backups from untrusted sources.

OWASP Top 10 for Web (2025)

A04:2025 Cryptographic FailuresA06:2025 Insecure Design

EU & UK References

Vulnerability Data

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui backup restore mechanism allows attackers to tamper with encrypted backup archives and inject malicious configuration during restoration. This issue has been patched…

more

in version 2.3.4.

CWE(s)
CWE-312CWE-347CWE-354

Related Threats

MITRE ATT&CK Enterprise Techniques

T1195 Supply Chain Compromise Initial Access
Adversaries may manipulate products or product delivery mechanisms prior to receipt by a final consumer for the purpose of data or system compromise.
attack.mitre.org →
T1552.001 Credentials In Files Credential Access
Adversaries may search local file systems and remote file shares for files containing insecurely stored credentials.
attack.mitre.org →
T1552.004 Private Keys Credential Access
Adversaries may search for private key certificate files on compromised systems for insecurely stored credentials.
attack.mitre.org →
T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
attack.mitre.org →
T1195.001 Compromise Software Dependencies and Development Tools Initial Access
Adversaries may manipulate software dependencies and development tools prior to receipt by a final consumer for the purpose of data or system compromise.
attack.mitre.org →
T1195.002 Compromise Software Supply Chain Initial Access
Adversaries may manipulate application software prior to receipt by a final consumer for the purpose of data or system compromise.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-42223Same product: Nginxui Nginx Ui
CVE-2026-42220Same product: Nginxui Nginx Ui
CVE-2026-27944Same product: Nginxui Nginx Ui
CVE-2026-33027Same product: Nginxui Nginx Ui
CVE-2024-22196Same product: Nginxui Nginx Ui
CVE-2026-33031Same product: Nginxui Nginx Ui
CVE-2026-33029Same product: Nginxui Nginx Ui
CVE-2026-42238Same product: Nginxui Nginx Ui
CVE-2024-23828Same product: Nginxui Nginx Ui
CVE-2024-22197Same product: Nginxui Nginx Ui

Affected Assets

nginxui
nginx ui
≤ 2.3.4

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 28 hardening rules · 5 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V14.2.8
  • V10.4.12

Mitigating Controls (NIST 800-53 r5) AI

SC-28 Protection of Information at Rest good match

SC-28 requires cryptographic or equivalent protection of sensitive data at rest, directly stopping cleartext storage in accessible resources.

SI-7 Software, Firmware, and Information Integrity good match

Requires integrity verification tools that detect unauthorized changes when checksum validation is missing or flawed.

SC-13 Cryptographic Protection good match

Requiring cryptographic protection mechanisms forces correct signature verification to be implemented for data protection.

SC-8 Transmission Confidentiality and Integrity good match

Requires protection of transmitted information integrity, directly mandating correct validation of integrity checks.

SC-23 Session Authenticity partial match

Protecting session authenticity requires correct verification of cryptographic signatures or equivalent mechanisms.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.DS-01 full match
prevents

Encryption and cryptographic controls for data-at-rest directly prevent cleartext storage of sensitive information.

PR.DS-02 mostly match
prevents

Digital signatures are explicitly cited to protect integrity of data-in-transit, so proper verification directly mitigates the weakness.

ID.RA-09 partial match
prevents

Requires assessing authenticity and integrity of acquired assets, which commonly relies on signature verification but is limited to pre-acquisition.

PR.PS-06 partial match
prevents

Secure SDLC practices include code signing and signature verification requirements, addressing the weakness during development.

RC.RP-03 partial match
prevents

Requires verification of backup integrity, covering validation only within recovery scenarios.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.24 Use of cryptography mostly match
prevents

Cryptographic controls mandate integrity mechanisms whose correct validation directly prevents CWE-354.

A.8.28 Secure coding mostly match
prevents

Secure coding standards require proper implementation and validation of checksums or MACs.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect missing integrity validation but does not itself implement the control.

A.7.14 Secure disposal or re-use of equipment partial match
mitigates

Requiring non-standard deletion or physical destruction of media ensures that sensitive information is not left in cleartext on discarded or repurposed equipment.

A.7.9 Security of assets off-premises partial match
mitigates

Secure deletion of data before device transfer prevents residual sensitive information from remaining in cleartext on storage media that leave organizational control.

A.8.10 Information deletion partial match
mitigates

Secure deletion of obsolete or temporary copies prevents sensitive data from remaining in cleartext on disk after its intended lifetime.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

Oracle Linux 8 (3 rules)
  • V-248574 YUM must be configured to prevent the installation of patches, service packs, device drivers, or OL 8 system components that have not been digitally signed using a certificate that is recognized and approved by the organization. prevents CWE-347, CWE-354
  • V-248525 All OL 8 local disk partitions must implement cryptographic mechanisms to prevent unauthorized disclosure or modification of all information that requires at-rest protection. prevents CWE-312
  • V-248575 OL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-347, CWE-354
Oracle Linux 9 (3 rules)
  • V-271525 OL 9 must have GPG signature verification enabled for all software repositories. prevents CWE-347
  • V-271523 OL 9 must check the GPG signature of locally installed software packages before installation. prevents CWE-347, CWE-354
  • V-271756 OL 9 local disk partitions must implement cryptographic mechanisms to prevent unauthorized disclosure or modification of all information that requires at rest protection. prevents CWE-312
RHEL 7 (2 rules)
  • V-204447 The Red Hat Enterprise Linux operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components from a repository without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-347, CWE-354
  • V-204448 The Red Hat Enterprise Linux operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-347, CWE-354
RHEL 8 (3 rules)
  • V-230264 RHEL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components from a repository without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-347, CWE-354
  • V-230224 All RHEL 8 local disk partitions must implement cryptographic mechanisms to prevent unauthorized disclosure or modification of all information that requires at rest protection. prevents CWE-312
  • V-230265 RHEL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-354
RHEL 9 (1 rule)
  • V-257822 RHEL 9 must have GPG signature verification enabled for all software repositories. prevents CWE-347

References