CVE-2023-47106

Public Exploit
Incorrect processing of fragment in the URL leads to Authorization Bypass in Traefik

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.

Category

4.8
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.10%
Third-Party Advisory github.com
Affected: traefik traefik
Published at:
Updated at:

References

Link Tags
https://github.com/traefik/traefik/security/advisories/GHSA-fvhj-4qfh-q2hm third party advisory exploit
https://datatracker.ietf.org/doc/html/rfc7230#section-5.3.1 not applicable
https://github.com/traefik/traefik/releases/tag/v2.10.6 release notes
https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5 release notes

Frequently Asked Questions

What is the severity of CVE-2023-47106?
CVE-2023-47106 has been scored as a medium severity vulnerability.
How to fix CVE-2023-47106?
To fix CVE-2023-47106, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-47106 being actively exploited in the wild?
It is possible that CVE-2023-47106 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-47106?
CVE-2023-47106 affects traefik traefik.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.