OpenMage magento-lts before 20.19.0 CSRF via PayPal Cancel Return Handlers
CVE-2026-128043

2.3LOW

Key Information:

Vendor

Openmage

Status
Magento-lts
Vendor
CVE Published:
13 November 2026

What is CVE-2026-128043?

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.

Affected Version(s)

magento-lts 0 < 20.19.0

magento-lts 21.0.0-beta1 < 21.0.0-beta3

magento-lts 20.19.0

References

https://github.com/OpenMage/magento-lts/security/advisori...
vendor-advisory
https://github.com/OpenMage/magento-lts/commit/86c8895d58...
patch
https://www.vulncheck.com/advisories/openmage-magento-lts...
third-party-advisory

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

skeletonsec
colinmollenhour
.