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Review reviewHigh

CVE-2026-48020

traefik traefik, Red Hat OpenShift Dev Spaces

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...

CVSS
7.8
EPSS
0.87%
55.1% percentile
CISA KEV
Not listed
Published
2026.06.24
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.87%
Technical severityCVSS 7.8

Vulnerability overview

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...

Affected product and versions

Product
traefik traefik, Red Hat OpenShift Dev Spaces
Affected versions
>= >= 3.7.0-ea.1, < 3.7.3, >= >= 3.0.0-beta1, < 3.6.19, >= < 2.11.48, < 2.11.48, >= 3.0.0 < 3.6.19, >= 3.7.0 < 3.7.3
Fixed versions
2.11.48, 3.6.19, 3.7.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that traefik traefik, Red Hat OpenShift Dev Spaces and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE
CWE-22, CWE-288
CVE-2026-48020 — traefik traefik, Red Hat OpenShift Dev Spaces | SECUFOCUS NOW