CVE-2026-27899Public exploitNetwork attack vector

Administrator escalation via unrestricted IsAdmin profile update

Published Feb 26, 2026 · Updated Feb 26, 2026

Incorrect authorization in h44z WireGuard Portal before 2.1.3 allows remote authenticated users to gain administrator access. The self-profile PUT handler binds the full JSON body to the user model and writes the client-controlled IsAdmin value because protected-field preservation omits that field. Any authenticated non-admin account can persist the change, then gain full control of portal users, API tokens, and WireGuard peers after a new session.

CVSS severity8.8
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in h44z WireGuard Portal before 2.1.3 allows remote authenticated users to gain administrator access. The self-profile PUT handler binds the full JSON body to the user model and writes the client-controlled IsAdmin value because protected-field preservation omits that field. Any authenticated non-admin account can persist the change, then gain full control of portal users, API tokens, and WireGuard peers after a new session.

The record

CVE
CVE-2026-27899
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
h44z
Product
WireGuard Portal
Classifications
CWE-863, CWE-269, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

h44z · WireGuard Portalversion=< 2.1.3

Published CVSS scores

8.8GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-269Improper Privilege Management
T1098Account Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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