CVE-2026-128044 json
OpenMage magento-lts before 20.18.2 OAuth Callback URL Allowlist Bypass
published 19d ago modified yesterday also EUVD-2026-125064 , GHSA-mffc-h5pf-6f42
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository OpenMage/magento-lts. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 7.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 8%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Is CVE-2026-128044 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-14).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N |
| CNA | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N |
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N |
Affected products
- OpenMage magento-lts
Classification
- Weakness
-
- CWE-346 Origin Validation Error
References
-
github.com
/OpenMage/magento-lts/commit/d03a00b60e4a2d4e5a00b44dbc66d25bc3b3fc8f
patch
-
github.com
/OpenMage/magento-lts/security/advisories/GHSA-mffc-h5pf-6f42
vendor-advisory, advisory
-
vulncheck.com
/advisories/openmage-magento-lts-before-20.18.2-oauth-callback-url-allowlist-bypass
third-party-advisory
Sources
- CVE List CVE-2026-128044
- NVD CVE-2026-128044
- Maintainer advisory GHSA-mffc-h5pf-6f42
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of OpenMage/magento-lts published their own advisory on GitHub. Reviewed sources take precedence over it.