# CVE-2026-102335 — NginxProxyManager nginx-proxy-manager

> As of 2026-09-28, CVE-2026-102335 is a HIGH-severity vulnerability in NginxProxyManager nginx-proxy-manager, CVSS v3.1 7.1, EPSS 0.2% (12.1th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-102335 as of 2026-09-28; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-28

## What is CVE-2026-102335?

Nginx Proxy Manager through 2.16.0 fails to restrict the advanced_config field to administrators, allowing non-admin users with manage permissions to inject arbitrary nginx directives. Attackers can inject malicious nginx configuration such as alias directives to serve arbitrary files or control routing for their assigned hosts.

The record classifies CVE-2026-102335 under weakness class [CWE-863](https://intel.threadlinqs.com/cwe/CWE-863). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 7 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.1 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N`)
- **CVSS v4.0 base score:** 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 12.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-28

## Is CVE-2026-102335 being exploited?

It currently carries a trending score of 33 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **NginxProxyManager**: nginx-proxy-manager

## How to fix CVE-2026-102335

No vendor patch reference has been recorded for CVE-2026-102335 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-102335

No threat campaign in the Threadlinqs corpus currently references CVE-2026-102335, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-09-29. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com — patch](https://github.com/NginxProxyManager/nginx-proxy-manager/pull/5908)

**Technical analysis**

- [github.com — technical description](https://github.com/NginxProxyManager/nginx-proxy-manager/blob/v2.16.0/backend/internal/user.js#L52-L62)
- [github.com — technical description (proxy host)](https://github.com/NginxProxyManager/nginx-proxy-manager/blob/v2.16.0/backend/templates/proxy_host.conf#L28)
- [github.com — technical description (README)](https://github.com/NginxProxyManager/nginx-proxy-manager/blob/v2.16.0/README.md#L36)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/nginx-proxy-manager-through-2.16.0-improper-authorization-via-advanced-config)

**Issue tracking and product pages**

- [github.com — issue tracking](https://github.com/NginxProxyManager/nginx-proxy-manager/issues/5749)
- [github.com — product](https://github.com/NginxProxyManager/nginx-proxy-manager)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-102335
Full detection coverage and IOCs for threats exploiting CVE-2026-102335 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp