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8.8
WireGuard Portal Allows Non-Admins to Gain Administrator Privileges
CVE-2026-27899
GHSA-5rmx-256w-8mj9
Summary
A security issue in WireGuard Portal lets a non-admin user become an administrator by changing their own profile, giving them access to sensitive features and data. This can happen if the user sends a specific request to their own user profile. To fix this, update to the latest version of WireGuard Portal, v2.1.3, or use a Docker image from the 'latest' tag built from the master branch.
What to do
- Update github.com h44z to version 2.1.3.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| github.com | h44z | <= 2.1.2 | 2.1.3 |
| wgportal | wireguard_portal | <= 2.1.3 | – |
Original title
WireGuard Portal is Vulnerable to Privilege Escalation via User Self-Update to Admin Level
Original 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.
## 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.
nvd CVSS3.1
8.8
Vulnerability type
CWE-269
Improper Privilege Management
CWE-863
Incorrect Authorization
- https://nvd.nist.gov/vuln/detail/CVE-2026-27899
- https://github.com/h44z/wg-portal/commit/fe4485037a25426446ced95050e9498f477bf71...
- https://github.com/h44z/wg-portal/releases/tag/v2.1.3
- https://hub.docker.com/layers/wgportal/wg-portal/v2.1.3/images/sha256-39acfab555...
- https://github.com/advisories/GHSA-5rmx-256w-8mj9
- https://github.com/h44z/wg-portal/security/advisories/GHSA-5rmx-256w-8mj9 Patch Vendor Advisory
Published: 26 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026