CVE-2026-25748 json
authentik has a forward authentication bypass with broken cookie
published 8mo ago modified 2mo ago also BIT-authentik-2026-25748 , EUVD-2026-6702 , GHSA-fj56-5763-j8pp
- cvss
- 8.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 52%
- public exploits
- 0
- none known
Summary
authentik is an open-source identity provider. Prior to 2025.10.4 and 2025.12.4, with a malformed cookie it was possible to bypass authentication when using forward authentication in the authentik Proxy Provider when used in conjunction with Traefik or Caddy as reverse proxy. When a malicious cookie was used, none of the authentik-specific X-Authentik-* headers were set which depending on application can grant access to an attacker. authentik 2025.10.4 and 2025.12.4 fix this issue.
Patch / fix
- bitnami authentik 2025.12.4
- goauthentik authentik 2025.10.4, 2025.12.4
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 8mo ago
Exploit prediction
0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | authentik | >=2025.10.0, <2025.12.4 |
2025.12.4 |
Affected products
- goauthentik authentik
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
github.com
/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp
vendor-advisory, advisory
-
github.com
/goauthentik/authentik/releases/tag/version%2F2025.10.4
product, release-notes, article
-
github.com
/goauthentik/authentik/releases/tag/version%2F2025.12.4
product, release-notes, article
-
nvd.nist.gov
/vuln/detail/CVE-2026-25748
web
Sources
- CVE List CVE-2026-25748
- NVD CVE-2026-25748
- OSV BIT-authentik-2026-25748
Fencer Intel 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.