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Fencer Vulns
critical 9.8

CVE-2026-49448 json

authentik: SourceStage bypass via empty POST

published 2026-06-02 5 mo ago modified 2026-09-08 2 mo ago also BIT-authentik-2026-49448 , EUVD-2026-34030 , GHSA-xp7f-xjjx-gwm8

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

authentik is an open-source identity provider. Prior to versions 2025.12.6, 2026.2.4, and 2026.5.1, the Source stage can be bypassed by sending an empty POST. This issue has been patched in versions 2025.12.6, 2026.2.4, and 2026.5.1.

Patch / fix

  • bitnami authentik 2025.12.6, 2026.2.4, 2026.5.1
  • goauthentik authentik 2025.12.6, 2026.2.4, 2026.5.1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/goauthentik/authentik/security/advisories/GHSA-xp7f-xjjx-gwm8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami authentik
<2025.12.6
>=2026.0.0, <2026.2.4
>=2026.3.0, <2026.5.1
2025.12.6
2026.2.4
2026.5.1

Affected products

  • goauthentik authentik

Classification

Weakness

References

Sources

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.