CVE-2026-128049

OpenMage Magento LTS before 20.18.2 CSRF via OAuth Authorization Confirm

Assigner: VulnCheck
Reserved: 12.11.2026 Published: 13.11.2026 Updated: 13.11.2026

OpenMage Magento LTS before 20.18.2 and 21.0.0-beta1 before 21.0.0-beta3 contains a cross-site request forgery vulnerability in the admin and storefront OAuth confirm and confirmSimple actions, which accept GET requests without form-key validation. Attackers holding OAuth consumer credentials can lure a logged-in administrator or customer to a crafted confirm URL that authorizes the attacker's request token, then exchange it at /oauth/token for a persistent REST API access token bound to the victim.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CVSS Score: 9.4

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CVSS Score: 9

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	Required	Availability Impact	High

CVSS 3.1

Product Status

Vendor	OpenMage
Product	magento-lts
Versions	Default: unaffected affected from 0 to 20.18.2 (excl.) Version 20.18.2 is unaffected

Vendor

OpenMage

Product

magento-lts

Versions

Default: unaffected

affected from 0 to 20.18.2 (excl.)
Version 20.18.2 is unaffected

Vendor	OpenMage
Product	magento-lts
Versions	Default: unaffected affected from 21.0.0-beta1 to 21.0.0-beta3 (excl.) Version 21.0.0-beta3 is unaffected