melhorenvio Melhor Envio Plugin up to 2.16.3 on WordPress authentication bypass

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.3$0-$5k1.77-

Summaryinfo

A vulnerability was found in melhorenvio Melhor Envio Plugin up to 2.16.3 on WordPress. It has been classified as critical. This affects an unknown function. This manipulation causes authentication bypass. The identification of this vulnerability is CVE-2026-54804. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in melhorenvio Melhor Envio Plugin up to 2.16.3 on WordPress and classified as critical. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a authentication bypass vulnerability. The CWE definition for the vulnerability is CWE-288. A product requires authentication, but the product has an alternate path or channel that does not require authentication. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Subscriber Broken Authentication in Melhor Envio <= 2.16.3 versions.

The weakness was shared by Hieupenguinnn. The advisory is shared at patchstack.com. This vulnerability is known as CVE-2026-54804 since 06/16/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/18/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-37640). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.6
CNA Vector (Patchstack): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authentication bypass
CWE: CWE-288 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/16/2026 CVE reserved
06/17/2026 +1 days Advisory disclosed
06/17/2026 +0 days VulDB entry created
06/18/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: patchstack.com
Researcher: Hieupenguinnn
Status: Not defined

CVE: CVE-2026-54804 (🔒)
GCVE (CVE): GCVE-0-2026-54804
GCVE (VulDB): GCVE-100-371929
EUVD: 🔒

Entryinfo

Created: 06/17/2026 14:13
Updated: 06/18/2026 04:51
Changes: 06/17/2026 14:13 (64), 06/18/2026 04:51 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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