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MEDIUM severity

Traefik vulnerable to Open Redirect via handling of X-Forwarded-Prefix headerGHSA-6qq8-5wq3-86rp

MEDIUMFix: containous/traefik#7109

GHSA-6qq8-5wq3-86rp is a medium-severity (CVSS 6.1) Open Redirect vulnerability in github.com/traefik/traefik. A fix is available for github.com/traefik/traefik — see the affected versions and patch details below.

Also known asCVE-2020-15129
Published
Updated
Affected
12 pkgs
Patched
12 / 12
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
8.0%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs95th percentile — riskier than 95% of all scored CVEsHighest risk
0.00%32.5%65.0%97.5%76.8%8.0%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-6qq8-5wq3-86rp by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

12 pkgs affected
🐹github.com/traefik/traefik🐹github.com/traefik/traefik/v2🐹github.com/containous/traefik🐹github.com/containous/traefik/v2🐹github.com/traefik/traefik/v2🐹github.com/containous/traefik/v2🐹github.com/traefik/traefik/api🐹github.com/traefik/traefik/v2/pkg/api+4 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Summary

There exists a potential open redirect vulnerability in Traefik's handling of the X-Forwarded-Prefix header. Active Exploitation of this issue is unlikely as it would require active header injection, however the Traefik team addressed this issue nonetheless to prevent abuse in e.g. cache poisoning scenarios.

Details

The Traefik API dashboard component doesn't validate that the value of the header X-Forwarded-Prefix is a site relative path and will redirect to any header provided URI.

e.g.

$ curl --header 'Host:traefik.localhost' --header 'X-Forwarded-Prefix:https://example.org' 'http://localhost:8081'
<a href="https://example.org/dashboard/">Found</a>.`

Impact

A successful exploitation of an open redirect can be used to entice victims to disclose sensitive information.

Workarounds

By using the headers middleware, the request header X-Forwarded-Prefix value can be overridden by the value . (dot)

For more information

If you have any questions or comments about this advisory, open an issue in Traefik.

Credit

This issue was found by the GitHub Application Security Team and reported on behalf of the GHAS by the GitHub Security Lab Team.

Affected Packages

12 total 12 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/traefik/traefik≥ 1.5.0-rc5&&< 1.7.261.7.26go get github.com/traefik/traefik@v1.7.26
🐹Gogithub.com/traefik/traefik/v2all versions2.3.0-rc6go get github.com/traefik/traefik/v2@v2.3.0-rc6
🐹Gogithub.com/containous/traefik≥ 1.5.0-rc5&&< 1.7.261.7.26go get github.com/containous/traefik@v1.7.26
🐹Gogithub.com/containous/traefik/v2all versions2.2.8go get github.com/containous/traefik/v2@v2.2.8
🐹Gogithub.com/traefik/traefik/v2≥ 2.3.0-rc1&&< 2.3.0-rc62.3.0-rc6go get github.com/traefik/traefik/v2@v2.3.0-rc6
🐹Gogithub.com/containous/traefik/v2≥ 2.3.0-rc1&&< 2.3.0-rc32.3.0-rc3go get github.com/containous/traefik/v2@v2.3.0-rc3

Affected Products

1 product · 5 configurations
Application
traefiktraefik
≥ 2.2.0 && < 2.2.8
1 version
2.3.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/traefik/traefik, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/traefik/traefik to 1.7.26 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-6qq8-5wq3-86rp is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

How to detect GHSA-6qq8-5wq3-86rp

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id ghsa-6qq8-5wq3-86rp -u https://target
Template
Traefik - Open Redirect
Severity
medium
Impact
An attacker can manipulate the redirect URL and trick users into visiting malicious websites.
Remediation
Apply the vendor-provided patch or upgrade to a non-vulnerable version of Traefik.

Template by ProjectDiscovery nuclei-templates (dwisiswant0), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

## Summary There exists a potential open redirect vulnerability in Traefik's handling of the `X-Forwarded-Prefix` header. Active Exploitation of this issue is unlikely as it would require active header injection, however the Traefik team addressed this issue nonetheless to prevent abuse in e.g. cache poisoning scenarios. ## Details The Traefik API dashboard component doesn't validate that the value of the header `X-Forwarded-Prefix` is a site relative path and will redirect to any header provided URI. e.g. ``` $ curl --header 'Host:traefik.localhost' --header 'X-Forwarded-Prefix:https://e
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