6.5

CVE-2023-47106: Incorrect processing of fragment in the URL leads to Authorization Bypass in Traefik

Modified
AliasesGHSA-fvhj-4qfh-q2hmGO-2023-2376
Published 04-12-2023Last modified 02-08-2024

Vulnerability summary

CVE-2023-47106 is a medium (CVSS 6.5) Improper Input Validation vulnerability in traefik. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 50% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 4.8, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.63%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 2 · Related 5
OPENSUSE-SU-2024:13506-1OPENSUSE-SU-2024:14076-1CGA-68J3-J8W9-5RJPCGA-CJ3C-XRGP-7454CGA-PPMM-35W3-P2W7

Timeline

  1. 04-12-2023
    PublishedVulnerability first disclosed.
  2. 02-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.63%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.63% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Traefik

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Github.com/traefik/traefik2 products
  • v2< 2.10.6
  • v3< 3.0.0-beta5
Github.com/traefik1 product
  • traefikAll versions (No fix recorded)
Traefik1 product
  • traefikEOL< 2.10.6 | ≥ 3.0.0-beta1, < 3.0.0-beta5 | ≤ 2.10.5 | 3.0.0:beta1 | 3.0.0:beta2 | 3.0.0:beta3 | 3.0.0:beta4

3 vendors · 4 products

References

6 links