CVE-2026-76842Network attack vector

API resource access via unencoded path identifiers

Published Aug 24, 2026 · Updated Aug 24, 2026

Path injection in Mercado Pago Node.js SDK 3.4.0 and earlier allows attackers to access API resources within a merchant token's scope. Payment, refund, advanced-payment, and disbursement-refund clients insert caller-supplied identifiers into URL templates without percent-encoding reserved characters, allowing path normalization or query injection to redirect authenticated requests. Reachability requires an integrating application to pass an untrusted identifier without an ownership check; resulting access remains bounded by the merchant token's permissions.

CVSS severityUnavailable
Unscored
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Path injection in Mercado Pago Node.js SDK 3.4.0 and earlier allows attackers to access API resources within a merchant token's scope. Payment, refund, advanced-payment, and disbursement-refund clients insert caller-supplied identifiers into URL templates without percent-encoding reserved characters, allowing path normalization or query injection to redirect authenticated requests. Reachability requires an integrating application to pass an untrusted identifier without an ownership check; resulting access remains bounded by the merchant token's permissions.

The record

CVE
CVE-2026-76842
Published
Aug 24, 2026
Updated
Aug 24, 2026
Vendor
Mercado Pago
Product
Mercado Pago
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=3.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Mercado Pago · Mercado Pagoversion=0 <=3.4.0

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo