# CVE-2026-27899: wg-portal PrivEsc — Fixed in 2.1.3

🐹

🐹 Go

Not in CISA KEV

HIGH severity

# CVE-2026-27899 — wg-portal

HIGH [Fix: h44z/wg-portal@fe44850](https://github.com/h44z/wg-portal/commit/fe4485037a25426446ced95050e9498f477bf71d)

CVE-2026-27899 is a high-severity (CVSS 8.8) Improper Privilege Management vulnerability in github.com/h44z/wg-portal. A fix is available for github.com/h44z/wg-portal — see the affected versions and patch details below.

WireGuard Portal Vulnerable to Privilege Escalation to Admin via User Self-Update

Also known as[GHSA-5rmx-256w-8mj9](/vulnerability/GHSA-5rmx-256w-8mj9)GO-2026-4566

Published

Feb 26, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

## Exploitation Status

### No confirmed exploitation observed yet

-   A successful exploit gives an attacker total control of the affected component, not partial access.
-   CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-27899.

## EPSS Exploitation Probability

[via FIRST.org ↗](https://www.first.org/epss/)

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs28th percentile — riskier than 28% of all scored CVEsHighest risk

0.00%0.35%0.70%1.05%0.1%0.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from [FIRST.org EPSS](https://www.first.org/epss/).

## How urgent is this, really

## Where this sits among everything scored

## Real-World Exposure

1 pkg affected

🐹`github.com/h44z/wg-portal`

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

## Description

## Privilege Escalation to Admin via User Self-Update in wg-portal

### Summary

Any authenticated non-admin user can become a full administrator by sending a single PUT request to their own user profile endpoint with `"IsAdmin": true` in the JSON body. After logging out and back in, the session picks up admin privileges from the database.

Tested against wg-portal v2.1.2 (Docker image `wgportal/wg-portal:v2`).

### Root Cause

When a user updates their own profile, the server parses the full JSON body into the user model, including the `IsAdmin` boolean field. A function responsible for preserving calculated or protected attributes pins certain fields to their database values (such as base model data, linked peer count, and authentication data), but it does not do this for `IsAdmin`. As a result, whatever value the client sends for `IsAdmin` is written directly to the database.

### Impact

After the exploit, the attacker has full admin access to the WireGuard VPN management portal. They can:

-   Read and modify every user account
-   Create, modify, and delete WireGuard peers on any interface
-   View WireGuard interface configurations
-   Disable or lock other user accounts
-   Access the full user list and their API tokens

### Patches

The problem was fixed in the latest release, [v2.1.3](https://github.com/h44z/wg-portal/releases/tag/v2.1.3). The [docker images](https://hub.docker.com/r/wgportal/wg-portal) for the tag 'latest' built from the master branch also include the fix.

## Affected Packages

1 total 1 fixed

Ecosystem

Package

Vulnerable range

Fix

🐹Go

`github.com/h44z/wg-portal` 

all versions

2.1.3`go get github.com/h44z/wg-portal@v2.1.3`

## Affected Products

1 product · 1 configurations

Application

`wireguard portal`wgportal

< 2.1.3

range

## Detection & mitigation playbook

Open-source dependency

1.  ### Detect
    
    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/h44z/wg-portal, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
    
2.  ### Fix
    
    Update github.com/h44z/wg-portal to 2.1.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-27899 is resolved across your whole dependency graph.
    
3.  ### Workarounds
    
    Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.
    

## Frequently Asked Questions

\# Privilege Escalation to Admin via User Self-Update in wg-portal ## Summary Any authenticated non-admin user can become a full administrator by sending a single PUT request to their own user profile endpoint with \`"IsAdmin": true\` in the JSON body. After logging out and back in, the session picks up admin privileges from the database. Tested against wg-portal v2.1.2 (Docker image \`wgportal/wg-portal:v2\`). ## Root Cause When a user updates their own profile, the server parses the full JSON body into the user model, including the \`IsAdmin\` boolean field. A function responsible for preservi

O3 Security · Impact-Aware SCA

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