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Traefik 2.x < 2.11.48 / 3.x < 3.6.19 / 3.7.x < 3.7.3 Authentication Bypass (CVE-2026-48020)

high Nessus Plugin ID 321447

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Synopsis

The remote macOS host is affected by an authentication bypass vulnerability.

Description

The version of Traefik installed on the remote macOS host is 2.x prior to 2.11.48, 3.x prior to 3.6.19, or 3.7.x prior to 3.7.3. It is, therefore, affected by an authentication bypass vulnerability:

 - The StripPrefix middleware allows unauthenticated attackers to bypass route-level authentication by crafting requests with path traversal sequences. Requests matching a public route with PathPrefix are prefix-stripped and path-normalized to resolve to protected paths guarded by an authenticated router. (CVE-2026-48020)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Traefik version 2.11.48, 3.6.19, 3.7.3, or later.

See Also

https://github.com/advisories/GHSA-xf64-8mw2-4gr2

Plugin Details

Severity: High

ID: 321447

File Name: macos_traefik_CVE-2026-48020.nasl

Version: 1.4

Type: Local

Agent: macosx

Published: 6/17/2026

Updated: 7/3/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.8

Percentile: 96.91

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-48020

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 7.8

Threat Score: 6.8

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Vulnerability Information

CPE: cpe:/a:traefik:traefik

Required KB Items: Host/local_checks_enabled, installed_sw/traefik

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/5/2026

Vulnerability Publication Date: 6/5/2026

Reference Information

CVE: CVE-2026-48020

IAVB: 2026-B-0167