authentik: Authentication bypass via assertion confusion in SAML sources
authentik is an open-source identity provider. Prior to 2026.2.7, 2026.5.7, and 2026.8.2, an authentik SAML Source verifies an assertion's signature and validity period but does not ensure that the identity provider issued the assertion for that Source or in response to a login request from that Source. The SAML Source also does not record already accepted assertions, allowing replay. An unauthenticated actor who possesses such a valid assertion can use an assertion intended for another service provider or reuse an earlier assertion to authenticate as the user named by the assertion. Only SAML Sources are affected; SAML Providers and other Source types are not affected. This issue is fixed in versions 2026.2.7, 2026.5.7, and 2026.8.2.
BIT-authentik-2026-94612
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:BIT-authentik-2026-94612
authentik
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 2026.2.7
Source reference:
/affected/0/ranges2026.5.7Source reference:
/affected/0/ranges2026.8.2Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "2026.2.7"
},
{
"introduced": "2026.5.0"
},
{
"fixed": "2026.5.7"
},
{
"introduced": "2026.8.0"
},
{
"fixed": "2026.8.2"
}
]
}
],
"package": {
"name": "authentik",
"purl": "pkg:bitnami/authentik",
"ecosystem": "Bitnami"
},
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
}
],
"database_specific": {
"source": "https://github.com/bitnami/vulndb/tree/main/data/authentik/BIT-authentik-2026-94612.json"
}
}
]- Related CVEs
- CVE-2026-94612
Source reference:
/aliases
Publisher severity
high
Source reference: /database_specific/severity
- Event
- #59616 · Revision 1
- Added to Heist Feed
- Publisher date