Magento LTS: Open Redirect via Unvalidated `uenc` Parameter in `stockAction()` - magento-lts
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-42207
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 18:23 UTC · Revision 1
Source evidence
Magento LTS: Open Redirect via Unvalidated `uenc` Parameter in `stockAction()` - magento-lts
core-osv · Original sourcePublished 15 May 2026, 17:06 UTC
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.
osv:CVE-2026-42207
Complete source record
{
"id": "412ec345e3edcbc9e765c8d9ca5a90a61ef23f1f467f0beb07f887bb292a0247",
"url": "https://osv.dev/vulnerability/CVE-2026-42207",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Magento LTS: Open Redirect via Unvalidated `uenc` Parameter in `stockAction()` - magento-lts",
"summary": "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.",
"evidence": "osv:CVE-2026-42207",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-42207",
"aliases": [
"CVE-2026-42207",
"GHSA-qpgq-5g92-j5q8"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/openmage/magento-lts",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "c565e96cc893b08fe9ae8e4efe4f5f26055fc57d"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "20.18.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "20.18.0"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
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"v20.0.0",
"v19.4.4",
"v19.4.3",
"v19.4.2",
"v19.4.1",
"v19.4.0",
"1.9.0.1",
"1.9.1.1",
"1.9.1.0-lts",
"1.9.0.0",
"1.8.1.0",
"1.7.0.2",
"1.7.0.1",
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"1.6.0.0-alpha1",
"1.5.1.0",
"1.5.0.1",
"1.5.0.0",
"1.5.0.0-rc2",
"1.5.0.0-rc1",
"1.5.0.0-beta2",
"1.5.0.0-beta1",
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"1.5.0.0-alpha1",
"1.4.2.0",
"1.4.1.1",
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"1.4.0.0-alpha3",
"1.4.0.0-alpha2",
"1.4.0.0-alpha1",
"1.3.2.3",
"1.3.2.2",
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"1.3.2",
"1.3.1.1",
"1.3.1",
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"1.2.0.3",
"1.2.0.2",
"1.2.0.1",
"1.2.0",
"1.1.8",
"1.1.7",
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"1.1.5",
"1.1.4",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42207.json"
}
}
],
"modified": "2026-10-28T02:30:38.422076991Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42207.json",
"https://github.com/OpenMage/magento-lts/security/advisories/GHSA-qpgq-5g92-j5q8",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42207"
],
"provider_metadata": {
"cwe_ids": [
"CWE-601"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42207.json"
}
},
"related_cves": [
{
"value": "CVE-2026-42207",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 505663,
"published_at": "2026-05-15T17:06:40.973+00:00"
}