CVE-2026-48020 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-48020HIGH

Traefik StripPrefix Route-Level Auth Bypass via Path Normalization

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   N   N   N    7.8   .0087   55.8     —

AFFECTED
  Product  Versions                  Fixed
  traefik  >= 3.7.0-ea.1, < 3.7.3 –  —

TIMELINE
  May 20  Reserved by GitHub_M
  Jun 23  EXPLOIT PUBLISHED — CVE-2026-48020 (traefik). Public exploit reference added.
  Jun 23  Published (CNA: GitHub_M)

CWE-288, CWE-22 · CNA: GitHub_M · CVSS v4.0 · 7 references · NVD status: Modified

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.48, 3.6.19, and 3.7.3, there is a high severity vulnerability in Traefik's StripPrefix middleware that allows an unauthenticated attacker to bypass route-level authentication and authorization. When a public router matches on a PathPrefix rule and applies the StripPrefix middleware, a request path containing .. or its percent-encoded form %2e%2e can match the public route at routing time and then, after the prefix is stripped and the path is normalized, resolve to a path served by a separate, authenticated router. As a result, an attacker can reach protected backend paths — such as admin or internal configuration endpoints — without satisfying the authentication middleware attached to the protected router. This vulnerability is fixed in 2.11.48, 3.6.19, and 3.7.3.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 20, 2026	Reserved	Reserved by GitHub_M
June 23, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-48020 (traefik). Public exploit reference added.
June 23, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
traefik	traefik	—	>= 3.7.0-ea.1, < 3.7.3	—

Weaknesses

CWE-288 · CWE-22

References (7)

https://access.redhat.com/security/cve/CVE-2026-48020
https://bugzilla.redhat.com/show_bug.cgi?id=2491915
https://github.com/traefik/traefik/releases/tag/v2.11.48 [Patch, Release Notes]
https://github.com/traefik/traefik/releases/tag/v3.6.19 [Patch, Release Notes]
https://github.com/traefik/traefik/releases/tag/v3.7.3 [Patch, Release Notes]
https://github.com/traefik/traefik/security/advisories/GHSA-xf64-8mw2-4gr2 [Exploit, Mitigation, Patch, Vendor Advisory]
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48020.json

Authoritative record: CVE-2026-48020 at cve.org

Vendors: traefik

Weaknesses: CWE-288 · CWE-22

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-48020 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.