CVE-2026-47201 json
authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user
published 2026-05-29 5 mo ago modified 2026-09-08 2 mo ago also BIT-authentik-2026-47201 , EUVD-2026-34027 , GHSA-c3m2-jqmq-pvp3
- cvss
- 8.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 7%
- public exploits
- 0
- none known
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.
Patch / fix
- go goauthentik.io 0.0.0-20260528144335-a370d76d23c7
- bitnami authentik 2026.5.1
- goauthentik authentik 2025.12.5, 2026.2.3, 2026.5.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 8.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
| OSV | 3.1 | 8.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | goauthentik.io | <0.0.0-20260528144335-a370d76d23c7 |
0.0.0-20260528144335-a370d76d23c7 |
| bitnami | authentik | <2026.5.1 |
2026.5.1 |
Affected products
- goauthentik authentik
Classification
References
-
github.com
/goauthentik/authentik/commit/a370d76d23c7de0fceed064ca322e33e6ebf0119
web
-
github.com
/goauthentik/authentik/security/advisories/GHSA-c3m2-jqmq-pvp3
web, mitigation, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-47201
advisory, web
-
github.com
/goauthentik/authentik
package
Sources
- CVE List CVE-2026-47201
- GitHub Advisory GHSA-c3m2-jqmq-pvp3
- NVD CVE-2026-47201
- OSV BIT-authentik-2026-47201
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.