High
authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user
Type: advisorySources: OSV
authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik's SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstream SAML responses. An attacker with any account at the upstream IdP can reuse a valid signed assertion to authenticate as another federated user. This issue has been patched in versions 2025.12.5, 2026.2.3, and 2026.5.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-47201
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 6 Nov 2026, 02:11 UTC · Revision 1
Source evidence
authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user
core-osv · Original sourcePublished 2 Jun 2026, 20:30 UTC
authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik's SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstream SAML responses. An attacker with any account at the upstream IdP can reuse a valid signed assertion to authenticate as another federated user. This issue has been patched in versions 2025.12.5, 2026.2.3, and 2026.5.1.
osv:CVE-2026-47201
Complete source record
{
"id": "ba6def7b79018abd8891907343dc13472fd0f1cbe3327ccb207b368cc27a76e7",
"url": "https://osv.dev/vulnerability/CVE-2026-47201",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user",
"summary": "authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik's SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstream SAML responses. An attacker with any account at the upstream IdP can reuse a valid signed assertion to authenticate as another federated user. This issue has been patched in versions 2025.12.5, 2026.2.3, and 2026.5.1.",
"evidence": "osv:CVE-2026-47201",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-47201",
"aliases": [
"BIT-authentik-2026-47201",
"CVE-2026-47201",
"GHSA-c3m2-jqmq-pvp3"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H"
}
],
"affected": [
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"repo": "https://github.com/goauthentik/authentik",
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"range": [
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{
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],
"modified": "2026-10-28T02:30:46.000412759Z",
"provider": "osv",
"references": [
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"https://github.com/goauthentik/authentik/security/advisories/GHSA-c3m2-jqmq-pvp3",
"https://nvd.nist.gov/vuln/detail/CVE-2026-47201"
],
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"source_id": "core-osv",
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"published_at": "2026-06-02T20:30:55.674+00:00"
}