High
Kyverno: ServiceAccount token leaked to external servers via apiCall service URL
Type: advisorySources: OSV
Kyverno is a policy engine designed for cloud native platform engineering teams. Prior to versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4, Kyverno's apiCall feature in ClusterPolicy automatically attaches the admission controller's ServiceAccount token to outgoing HTTP requests. The service URL has no validation — it can point anywhere, including attacker-controlled servers. Since the admission controller SA has permissions to patch webhook configurations, a stolen token leads to full cluster compromise. Versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4 patch the issue.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-41323
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 16:32 UTC · Revision 1
Source evidence
Kyverno: ServiceAccount token leaked to external servers via apiCall service URL
core-osv · Original sourcePublished 24 Apr 2026, 03:21 UTC
Kyverno is a policy engine designed for cloud native platform engineering teams. Prior to versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4, Kyverno's apiCall feature in ClusterPolicy automatically attaches the admission controller's ServiceAccount token to outgoing HTTP requests. The service URL has no validation — it can point anywhere, including attacker-controlled servers. Since the admission controller SA has permissions to patch webhook configurations, a stolen token leads to full cluster compromise. Versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4 patch the issue.
osv:CVE-2026-41323
Complete source record
{
"id": "2e9b19d901eaf3699303abbb7cdc86aecd71211460648120fc21fb12631fc0b5",
"url": "https://osv.dev/vulnerability/CVE-2026-41323",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Kyverno: ServiceAccount token leaked to external servers via apiCall service URL",
"summary": "Kyverno is a policy engine designed for cloud native platform engineering teams. Prior to versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4, Kyverno's apiCall feature in ClusterPolicy automatically attaches the admission controller's ServiceAccount token to outgoing HTTP requests. The service URL has no validation — it can point anywhere, including attacker-controlled servers. Since the admission controller SA has permissions to patch webhook configurations, a stolen token leads to full cluster compromise. Versions 1.18.0-rc1, 1.17.2-rc1, and 1.16.4 patch the issue.",
"evidence": "osv:CVE-2026-41323",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-41323",
"aliases": [
"BIT-kyverno-2026-41323",
"CVE-2026-41323",
"GHSA-f9g8-6ppc-pqq4",
"GO-2026-5351"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/kyverno/kyverno",
"type": "GIT",
"events": [
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"introduced": "0"
},
{
"fixed": "ead0a548e9b0e8746c6175abb53f8edff0aa5f1e"
},
{
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},
{
"fixed": "f64c0f5820a022d354c77316785d08511d2a5cc4"
},
{
"fixed": "bc4f91c4801b1eaa2edc0a14e2f1b0af8cf0c1f5"
},
{
"fixed": "c2eab00033e635bda4e4efb58c1b472b41728bb6"
},
{
"fixed": "f70e8ac1e7acd2e3844f9553e4a884f07f953de0"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:kyverno:kyverno:*:-:*:*:*:*:*:*",
"range": [
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"introduced": "0"
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{
"fixed": "1.16.4"
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"source": "CPE_RANGE"
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{
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"range": [
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{
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}
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},
{
"range": [
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],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
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"source": "REFERENCES_COMMIT"
},
{
"range": [
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}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41323.json"
}
}
],
"modified": "2026-10-28T02:30:37.304773001Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41323.json",
"https://github.com/kyverno/kyverno/security/advisories/GHSA-f9g8-6ppc-pqq4",
"https://nvd.nist.gov/vuln/detail/CVE-2026-41323",
"https://github.com/kyverno/kyverno/commit/bc4f91c4801b1eaa2edc0a14e2f1b0af8cf0c1f5",
"https://github.com/kyverno/kyverno/commit/c2eab00033e635bda4e4efb58c1b472b41728bb6",
"https://github.com/kyverno/kyverno/commit/f70e8ac1e7acd2e3844f9553e4a884f07f953de0"
],
"provider_metadata": {
"cwe_ids": [
"CWE-200",
"CWE-918"
],
"cna_assigner": "GitHub_M",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "1.17.0-rc1"
},
{
"fixed": "1.17.2-rc1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41323.json"
}
},
"related_cves": [
{
"value": "CVE-2026-41323",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 504721,
"published_at": "2026-04-24T03:21:36.265+00:00"
}