CVE-2026-88009 Traefik - Authorization Bypass

Traefik < 2.11.57 and < 3.7.13 contains a cross-vhost routing bypass caused by accepting rootless HTTP/1 request targets stored in URL.Opaque but forwarding them verbatim to backend, letting attackers bypass path-scoped authorization and access logging, exploit requires crafted HTTP/1 requests.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.44% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Broken Access Control, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-444

Vendor fix

Update to versions 2.11.57 or 3.7.13 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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