---
id: "CVE-2026-128044"
page: "https://infrastack.ai/live/CVE-2026-128044"
kind: "vulnerability"
aliases: ["CVE-2026-128044"]
title: "OpenMage magento-lts: OAuth callback check lets attackers steal access tokens"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["magento", "magento-lts", "oauth", "openmage", "php", "runtime", "self-hosted"]
not_affected_if: ["no-leaked-consumer-keys", "oauth-not-used", "versions-patched"]
published_at: "2026-11-13T10:18:10+00:00"
first_seen_at: "2026-11-13T10:47:32+00:00"
updated_at: "2026-11-13T10:50:19+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-128044", "first_seen_at": "2026-11-13T10:47:32+00:00"}]
exploit_sources: []
---

# OpenMage magento-lts: OAuth callback check lets attackers steal access tokens

Link for people: https://infrastack.ai/live/CVE-2026-128044 (this .md is for agents)

OpenMage magento-lts validates OAuth 1.0a callback URLs with a string-prefix check that falls back to accepting any well-formed URL. An attacker holding a leaked consumer key and secret can redirect an approving admin's or customer's request token and verifier to their own server and obtain an access token with the victim's API privileges.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed version of magento-lts or OpenMage in composer.json or the lock file, and see whether it is below `20.18.2` on the 20.x line or below `21.0.0-beta3` on the 21.x line.
- Check whether OAuth 1.0a API integrations are enabled in the admin under System > Integrations.
- Check whether any OAuth consumer key and secret have leaked or been shared outside the team.

## Fix

- magento-lts (20.x line): upgrade to `20.18.2`
- magento-lts (21.x line): upgrade to `21.0.0-beta3`

## Timeline

- 2026-11-13T10:47:32+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-128044

## Documents

- [advisory] Vendor advisory: github.com https://github.com/OpenMage/magento-lts/security/advisories/GHSA-mffc-h5pf-6f42
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.18.2-oauth-callback-url-allowlist-bypass
- [fix] Patch: github.com https://github.com/OpenMage/magento-lts/commit/d03a00b60e4a2d4e5a00b44dbc66d25bc3b3fc8f

## From the sources

OpenMage magento-lts before 20.18.2 and 21.x before 21.0.0-beta3 validates OAuth 1.0a oauth_callback URLs with a string-prefix check and falls back to accepting any well-formed URL. Attackers holding a leaked consumer key and secret can supply host-suffix, userinfo, or arbitrary callback URLs to capture an approving administrator's or customer's request token and verifier, then obtain an access token with the victim's API privileges.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_