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Authentication Bypass

🗓️ 14 May 2026 17:21:38Reported by Veracode Vulnerability DatabaseType 
veracode
 veracode
🔗 sca.analysiscenter.veracode.com👁 28 Views

Traefik authentication bypass due to header alias sanitization flaw allowing spoofed headers on protected routes.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-39858
30 Apr 202620:26
–attackerkb
alpinelinux
AlpineLinux
CVE-2026-39858
30 Apr 202620:26
–alpinelinux
bdu_fstec
BDU FSTEC
ForwardAuth Reverse Proxy Server Containous Traefik Authentication Bypass
12 May 202600:00
–bdu_fstec
circl
Circl
CVE-2026-39858
24 Apr 202613:35
–circl
cnnvd
CNNVD
Traefik security vulnerabilities
30 Apr 202600:00
–cnnvd
cve
CVE
CVE-2026-39858
30 Apr 202620:26
–cve
cvelist
Cvelist
CVE-2026-39858 Traefik: Forwarded alias spoofing top pre-auth decision bypass
30 Apr 202620:26
–cvelist
euvd
EUVD
EUVD-2026-26427
30 Apr 202620:26
–euvd
euvd
EUVD
EUVD-2026-41940
6 Aug 202616:53
–euvd
github
Github Security Blog
Traefik: Pre-authentication decision bypass due to forwarded alias spoofing
24 Apr 202616:32
–github
Rows per page
Vulners
Node
OR
traefikgithub.com/traefik/traefikRangev1.0.alpha.0e683cc5355bc507dabac68bbc7559d3f179e185–1.0.alpha.0e683cc5355bc507dabac68bbc7559d3f179e185go
traefikgithub.com/traefik/traefikRangev3.7.0-ea.1–3.7.0-ea.1go
traefikgithub.com/traefik/traefikRangev3.0.0-beta1–3.0.0-beta1go

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15 Jul 2026 05:56Current
8.3High risk
Vulners AI Score8.3
CVSS 3.110
CVSS 47.8
EPSS0.00479
SSVC
28