CVE-2023-47106 Incorrect processing of fragment in the URL leads to Authorization Bypass in Traefik
Traefik incorrectly forwards URL fragments, allowing attackers to bypass frontend proxy access controls when used with another proxy like Nginx.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-47106?
CVE-2023-47106 is a medium-severity authentication bypass vulnerability in Traefik Traefik, published on 4 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Traefik is an open source HTTP reverse proxy and load balancer. When a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates RFC 7230 because in the origin-form the URL should only contain the absolute path and the query. When this is combined with another frontend proxy like Nginx, it can be used to bypass frontend proxy URI-based access control restrictions. This vulnerability has been addressed in versions 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Weakness: CWE-20
Which versions are affected by CVE-2023-47106?
7 open source packages ship an affected version, including github.com/traefik/traefik/v2, github.com/traefik/traefik and github.com/traefik/traefik/v3. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik/v2 Go | All versions | 2.10.6 |
github.com/traefik/traefik/v2 Go | All versions | 2.10.6 |
github.com/traefik/traefik/v2 Go | All versions | 2.10.6 |
github.com/traefik/traefik Go | All versions | None |
github.com/traefik/traefik/v3 Go | All versions | 3.0.0-beta5 |
github.com/traefik/traefik/v3 Go | All versions | 3.0.0-beta5 |
1 more packages
github.com/traefik/traefik/v3 Go | All versions | 3.0.0-beta5 |
Products include Traefik Traefik.
How do I fix CVE-2023-47106?
Upgrade github.com/traefik/traefik/v2 to 2.10.6 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2023-47106 being exploited?
There is no known exploitation of CVE-2023-47106 in the wild and no public exploit code.
Other vulnerabilities in Traefik Traefik
- CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik
- CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
- CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
- CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse
- CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Sources
Also known as ECHO-3ccf-9fb8-6ebf, GHSA-fvhj-4qfh-q2hm, GO-2023-2376.