CVE-2026-42207

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to 20.18.0, Mage_ProductAlert_AddController::stockAction() reads the uenc query parameter and passes it directly to $this->_redirectUrl($backUrl) without calling $this->_isUrlInternal(). When the supplied product_id does not match any catalog product, the server issues an unvalidated HTTP 302 redirect to whatever URL was provided as uenc. This vulnerability is fixed in 20.18.0.

CVSS v3
6.1
EG Score
6.1(medium)
EPSS
4.5%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 18, 2026

Advisory Details (1)

Auto-updated May 15, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Open Redirect via Unvalidated `uenc` Parameter in `stockAction()` - magento-lts · Advisory · OpenMage/magento-lts · GitHub

https://github.com/OpenMage/magento-lts/security/advisories/GHSA-qpgq-5g92-j5q8

Vendor Advisories for CVE-2026-42207(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
openmage/magento-lts1.9.1.1 ... v20.9.0 (91 versions)20.18.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
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  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-01 15:06 UTCEPSS rescore
  10. 2026-06-30 23:22 UTCEPSS rescore
  11. 2026-06-29 21:30 UTCEG score recompute
  12. 2026-06-29 14:06 UTCEPSS rescore
  13. 2026-06-28 14:07 UTCEPSS rescore
  14. 2026-06-28 04:56 UTCEPSS rescore
  15. 2026-06-27 21:53 UTCEG score recompute
  16. 2026-06-27 03:08 UTCEPSS rescore
  17. 2026-06-26 20:12 UTCEG score recompute
  18. 2026-06-25 18:47 UTCEG score recompute
  19. 2026-06-25 13:49 UTCEPSS rescore
  20. 2026-06-25 13:49 UTCEPSS rescore
  21. 2026-06-24 14:05 UTCEPSS rescore
  22. 2026-06-23 21:33 UTCEPSS rescore
  23. 2026-06-22 14:25 UTCEPSS rescore
  24. 2026-06-22 14:25 UTCEPSS rescore
  25. 2026-06-21 14:56 UTCEPSS rescore
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  1. 2026-06-21 14:56 UTCEPSS rescore
  2. 2026-06-21 01:59 UTCEPSS rescore
  3. 2026-06-19 19:25 UTCEPSS rescore
  4. 2026-06-18 17:52 UTCEPSS rescore
  5. 2026-06-18 17:52 UTCEPSS rescore
  6. 2026-06-17 17:53 UTCEPSS rescore
  7. 2026-06-17 05:04 UTCEG score recompute
  8. 2026-06-16 17:52 UTCEPSS rescore
  9. 2026-06-16 05:11 UTCEG score recompute
  10. 2026-06-15 17:49 UTCEPSS rescore
  11. 2026-06-15 05:14 UTCEG score recompute
  12. 2026-06-14 05:27 UTCEG score recompute
  13. 2026-06-13 23:00 UTCEPSS rescore
  14. 2026-06-13 04:04 UTCEG score recompute
  15. 2026-06-12 23:12 UTCEPSS rescore
  16. 2026-06-12 23:12 UTCEPSS rescore
  17. 2026-06-12 03:16 UTCEG score recompute
  18. 2026-06-11 14:00 UTCEPSS rescore
  19. 2026-06-11 03:28 UTCEG score recompute
  20. 2026-06-10 22:18 UTCEPSS rescore
  21. 2026-06-10 13:22 UTCEPSS rescore
  22. 2026-06-10 13:22 UTCEPSS rescore
  23. 2026-06-10 03:41 UTCEG score recompute
  24. 2026-06-09 03:54 UTCEG score recompute
  25. 2026-06-08 14:17 UTCEPSS rescore
  26. 2026-06-08 14:17 UTCEPSS rescore
  27. 2026-06-08 04:06 UTCEG score recompute
  28. 2026-06-07 15:25 UTCEPSS rescore
  29. 2026-06-07 15:25 UTCEPSS rescore
  30. 2026-06-07 04:19 UTCEG score recompute
  31. 2026-06-06 13:47 UTCEPSS rescore
  32. 2026-06-06 13:47 UTCEPSS rescore
  33. 2026-06-06 04:31 UTCEG score recompute
  34. 2026-06-05 22:47 UTCEPSS rescore
  35. 2026-06-05 06:10 UTCEPSS rescore
  36. 2026-06-05 06:10 UTCEPSS rescore
  37. 2026-06-05 04:44 UTCEG score recompute
  38. 2026-06-04 13:12 UTCEPSS rescore
  39. 2026-06-04 13:12 UTCEPSS rescore
  40. 2026-06-04 04:56 UTCEG score recompute
  41. 2026-06-03 05:08 UTCEG score recompute
  42. 2026-06-02 20:13 UTCEPSS rescore
  43. 2026-06-02 05:21 UTCEG score recompute
  44. 2026-06-01 13:52 UTCEPSS rescore
  45. 2026-06-01 13:52 UTCEPSS rescore
  46. 2026-06-01 05:33 UTCEG score recompute
  47. 2026-05-31 22:30 UTCEPSS rescore
  48. 2026-05-31 22:30 UTCEPSS rescore
  49. 2026-05-31 00:16 UTCEPSS rescore
  50. 2026-05-31 00:16 UTCEPSS rescore
  51. 2026-05-29 13:44 UTCEPSS rescore
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  53. 2026-05-28 13:44 UTCEPSS rescore
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  56. 2026-05-27 13:40 UTCEPSS rescore
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  58. 2026-05-27 13:40 UTCEPSS rescore
  59. 2026-05-26 13:44 UTCEPSS rescore
  60. 2026-05-26 07:18 UTCEPSS rescore
  61. 2026-05-26 07:18 UTCEPSS rescore
  62. 2026-05-23 00:07 UTCEG score recompute
  63. 2026-05-20 22:38 UTCEPSS rescore
  64. 2026-05-20 22:38 UTCEPSS rescore
  65. 2026-05-20 12:02 UTCEG score recompute
  66. 2026-05-20 11:22 UTCEPSS rescore
  67. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-42207?
CVE-2026-42207 is a medium vulnerability published on May 15, 2026. Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to 20.18.0, MageProductAlertAddController::stockAction() reads the uenc query parameter and…
When was CVE-2026-42207 disclosed?
CVE-2026-42207 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42207 actively exploited?
CVE-2026-42207 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42207?
CVE-2026-42207 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-42207?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42207, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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