Medium
Rancher: Identity-field mutation in /v3/users allows account hijack via principal rebind
Type: advisorySources: OSV
A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings. This issue affects Rancher: before 2.15.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-71403
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 18:14 UTC · Revision 1
Source evidence
Rancher: Identity-field mutation in /v3/users allows account hijack via principal rebind
core-osv · Original sourcePublished 3 Sept 2026, 14:45 UTC
A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings. This issue affects Rancher: before 2.15.1.
osv:CVE-2026-71403
Complete source record
{
"id": "dde48f77f3c631d689e8d88d6bf74475f004ff331c24e642310940da60bd30c0",
"url": "https://osv.dev/vulnerability/CVE-2026-71403",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Rancher: Identity-field mutation in /v3/users allows account hijack via principal rebind",
"summary": "A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings. This issue affects Rancher: before 2.15.1.",
"evidence": "osv:CVE-2026-71403",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-71403",
"aliases": [
"CVE-2026-71403"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/rancher/rancher",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "8c257d748d23d4812092e28cc92b2a6f3e4dd594"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "2.15.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"cpe": "cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.15.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71403.json"
}
}
],
"modified": "2026-10-28T02:30:22.031376688Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71403.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-71403",
"https://github.com/rancher/rancher/pull/56616",
"https://github.com/rancher/rancher"
],
"provider_metadata": {
"cwe_ids": [
"CWE-639"
],
"cna_assigner": "suse",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71403.json"
}
},
"related_cves": [
{
"value": "CVE-2026-71403",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 488231,
"published_at": "2026-09-03T14:45:37.468+00:00"
}