CVE-2026-27899
HIGH
GHSA-5rmx-256w-8mj9
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
WireGuard Portal (or wg-portal) is a web-based configuration portal for WireGuard server management. Prior to version 2.1.3, 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. 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. After the exploit, the attacker has full admin access to the WireGuard VPN management portal. The problem was fixed in v2.1.3. The docker images for the tag 'latest' built from the master branch also include the fix.
Analysis
Privilege escalation in WireGuard Portal prior to version 2.1.3 allows authenticated non-admin users to gain full administrator access by modifying their own user profile with an IsAdmin flag set to true. The vulnerability exists because the server fails to properly validate and restrict the IsAdmin field during profile updates, allowing the privilege change to persist after re-authentication. …
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Remediation
Within 24 hours: Identify all WireGuard Portal instances and their versions; assess user account activity logs for suspicious privilege escalation attempts. Within 7 days: Apply vendor patch to version 2.1.3 or later on all affected systems; audit all user accounts for unauthorized admin status and revoke illegitimate permissions. …
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External POC / Exploit Code
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