NVD / CVE Program· CNA GitHub_M

CVE-2026-33027: Nginx UI: Improper Path Validation Allows Recursive Deletion of the Nginx Configuration Directory

Noroxi assessment

Priority: Monitor (action score 27/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.41% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: 0xJacky nginx-ui 2.3.4.

Low priority for now. Upgrade to 0xJacky nginx-ui 2.3.4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui configuration improperly handles URL-encoded traversal sequences. When specially crafted paths are supplied, the backend resolves them to the base Nginx configuration directory and executes the operation on the base directory (/etc/nginx). In particular, this allows an authenticated user to remove the entire /etc/nginx directory, resulting in a partial Denial of Service. This issue has been patched in version 2.3.4.

MediumCVSS 6.9 · v4.0—No exploit Fix available

Path traversal

Published: Mar 30, 2026
Updated: Jun 17, 2026
EPSS: 0.4% · 35th percentile
CWE: CWE-22

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 27 / 40 · 6.9 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.4%

CISA SSVC decision

Exploitation: proof of concept
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · GitHub_M: 6.9; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
nginxui	nginx ui	cpe:2.3:a:nginxui:nginx_ui

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

nginxui nginx uibefore 2.3.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

0xJacky nginx-ui
- < 2.3.4affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Go	github.com/0xJacky/Nginx-UI	from 0	—
Go	github.com/0xJacky/Nginx-UI	up to and including 1.99	—
openSUSE:Leap 15.6	govulncheck-vulndb	before 0.0.20260402T184258-150000.1.158.1	0.0.20260402T184258-150000.1.158.1

Same product

nginxui: all records

Other highest-scoring records for the same primary product.

CVE-2026-33032Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
50Plan
CVE-2026-27944Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
46Plan
CVE-2024-49368Unchecked logrotate settings lead to arbitrary command execution
43Plan

Published before and after this one in the same product

← EarlierCVE-2024-49366Oct 21, 2024 · Nginx UI's json field can construct a directory traversal payload, causing arbitrary files to be written
30Monitor
← EarlierCVE-2024-49367Oct 21, 2024 · Nginx UI's log path can be controlled
22Monitor
Later →CVE-2026-33028Mar 30, 2026 · Nginx UI: Race Condition Leads to Persistent Data Corruption and Service Collapse
28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
0xJacky nginx-ui	2.3.4 · description	Vendor (CNA)
opensuse:govulncheck-vulndb	0.0.20260402T184258-150000.1.158.1 · openSUSE:Leap 15.6	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2024-49366525 days apartNginx UI's json field can construct a directory traversal payload, causing arbitrary files to be written
30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

CVE-2026-330320 days apartNginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
50Plan
CVE-2026-2794425 days apartNginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
46Plan
CVE-2026-4222135 days apartnginx-ui: Unauthenticated First-Run Installer Allows Remote Initial Admin Claim
39Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
Administrator privileges are required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Network
Attack complexity: Low
Privileges required: High
User interaction: None
Scope: X

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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

nvd-secondary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:46 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/0xJacky/nginx-ui/releases/tag/v2.3.4

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records