VulnerabilityPublished 6 Aug 2026

CVE-2026-28180: Mercado Pago payments for WooCommerce (WordPress plugin) · Insecure Direct Object Reference

Affects Mercado Pago payments for WooCommerce (WordPress plugin)Source CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 24% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-qc5m-7r97-w8mq

What to do

Affected software

Product	Affected	Fixed in
Mercado PagoMercado Pago payments for WooCommerce	Affected ≥ n/a, < 8.9.1	Fixed in–

AI-suggested

Until a patch is available, restricting access to the affected plugin or disabling it may reduce exposure.

Description

CVE-2026-28180 is a medium severity vulnerability in Mercado Pago payments for WooCommerce versions up to and including 8.9.0. It involves an unauthenticated Insecure Direct Object Reference (IDOR) vulnerability, classified under CWE-639, which allows authorization bypass through a user-controlled key. This vulnerability could allow an attacker to access certain resources without proper authorization. No official patch or remediation guidance is currently available from the vendor.

Impact

An attacker can bypass authorization controls without authentication by exploiting the IDOR vulnerability, potentially gaining unauthorized access to certain resources or data. The impact is limited to confidentiality loss; integrity and availability are not affected. The medium CVSS score reflects the moderate risk posed by this vulnerability.

Summary

This vulnerability (CVE-2026-28180) affects Mercado Pago payments for WooCommerce versions <= 8.9.0. It is an unauthenticated Insecure Direct Object Reference (IDOR) vulnerability, CWE-639, that permits authorization bypass via a user-controlled key. The CVSS 3.1 base score is 5.3 (medium severity), with network attack vector, low attack complexity, no privileges required, no user interaction, and limited confidentiality impact. No official remediation or patch has been disclosed, and there are no known exploits in the wild.

CWE-639Authorization Bypass Through User-Controlled Key (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #24OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
Architecture and Design
For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.
Architecture and Design · Implementation
Make sure that the key that is used in the lookup of a specific user's record is not controllable externally by the user or that any tampering can be detected.
Architecture and Design
Use encryption in order to make it more difficult to guess other legitimate values of the key or associate a digital signature with the key so that the server can verify that there has been no tampering.
OWASP Cheat Sheets
Access Control (opens in a new tab)
Authorization Testing Automation (opens in a new tab)
Cross-Site Request Forgery Prevention (opens in a new tab)
Insecure Direct Object Reference Prevention (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V4.1.2 (opens in a new tab)
V4.2.1 (opens in a new tab)
V8.3.8 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

patchstack.com/database/wordpress/plugin/woocommerce-mercadopago/vulnerability/wordpress-mercado-pago-payments-for-woocommerce-plugin-8-9-0-insecure-direct-object-references-idor-vulnerability?_s_id=cve (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 13 Aug 2026, 17:20 UTC

WeaknessesCWE-639

Technical details

References

Community reviews

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