OpenMage magento-lts up to 20.18.9/20.x PayPal Return Handlers /paypal/standard/cancel cross-site request forgery

CVSS Meta Temp Score
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CTI Interest Score
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3.6$0-$5k0.00+

Summaryinfo

A vulnerability categorized as problematic has been discovered in OpenMage magento-lts up to 20.18.9/20.x. Affected by this issue is some unknown functionality of the file /paypal/standard/cancel of the component PayPal Return Handlers. Such manipulation leads to cross-site request forgery. This vulnerability is documented as CVE-2026-128043. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenMage magento-lts up to 20.18.9/20.x. It has been rated as problematic. Affected by this issue is an unknown functionality of the file /paypal/standard/cancel of the component PayPal Return Handlers. The manipulation with an unknown input leads to a cross-site request forgery vulnerability. Using CWE to declare the problem leads to CWE-352. The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. Impacted is integrity. CVE summarizes:

OpenMage magento-lts before 20.19.0 and 21.0.0-beta1 before 21.0.0-beta3 contains a cross-site request forgery vulnerability in PayPal cancel and decline return handlers that trust only the checkout session without verifying the request came from PayPal. Attackers can lure a shopper into a cross-site GET to paypal/standard/cancel to cancel their recent uninvoiced order, void pending authorizations, and restore items to the cart.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-128043 since 11/12/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 20.19.0 or 21.0.0-beta3 eliminates this vulnerability.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.6

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.1
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Cross-site request forgery
CWE: CWE-352 / CWE-862 / CWE-863
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: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: magento-lts 20.19.0/21.0.0-beta3

Timelineinfo

11/12/2026 CVE reserved
11/13/2026 +1 days Advisory disclosed
11/13/2026 +0 days VulDB entry created
11/13/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CNA: VulnCheck
CVE: CVE-2026-128043 (🔒)

GCVE (CVE): GCVE-0-2026-128043
GCVE (VulDB): GCVE-100-436976

Entryinfo

Created: 11/13/2026 12:19
Changes: 11/13/2026 12:19 (78)
Complete: 🔍
Cache ID: 216::103

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