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CVE-2020-15129· NVD / CVE Program· CNA GitHub_M

Open redirect in Traefik

In Traefik before versions 1.7.26, 2.2.8, and 2.3.0-rc3, there exists a potential open redirect vulnerability in Traefik's handling of the "X-Forwarded-Prefix" header. 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. Successful exploitation of an open redirect can be used to entice victims to disclose sensitive information. 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.

MediumCVSS 4.7 · v3.1—Proof of concept Fix available
Published
Jul 30, 2020
Updated
Jun 16, 2026
EPSS
8.0% · 95th percentile
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Report tools

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Action score

20

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 8.0%

CNA vs NVD score

NVD
4.7
CNA · GitHub_M
6.1
1.4 point gap

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

VendorProduct
traefiktraefik

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • traefik traefikbefore 1.7.26
  • traefik traefik2.2.0 and later · before 2.2.8
  • traefik traefik2.3.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • containous traefik

    • < 1.7.26, >= 2.0.0, < 2.2.8affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gogithub.com/containous/traefikfrom 1.5.0-rc5 · before 1.7.261.7.26
Gogithub.com/containous/traefik/apifrom 1.5.0-rc5 · before 1.7.261.7.26
Gogithub.com/containous/traefik/v2from 2.3.0-rc1 · before 2.3.0-rc32.3.0-rc3
Gogithub.com/containous/traefik/v2before 2.2.82.2.8
Gogithub.com/containous/traefik/v2/pkg/apifrom 2.3.0-rc1 · before 2.3.0-rc32.3.0-rc3
Gogithub.com/containous/traefik/v2/pkg/apibefore 2.2.82.2.8
Gogithub.com/traefik/traefikfrom 1.5.0-rc5 · before 1.7.261.7.26
Gogithub.com/traefik/traefik/apifrom 1.5.0-rc5 · before 1.7.261.7.26
Gogithub.com/traefik/traefik/v2from 2.3.0-rc1 · before 2.3.0-rc62.3.0-rc6
Gogithub.com/traefik/traefik/v2before 2.3.0-rc62.3.0-rc6
Gogithub.com/traefik/traefik/v2/pkg/apifrom 2.3.0-rc1 · before 2.3.0-rc62.3.0-rc6
Gogithub.com/traefik/traefik/v2/pkg/apibefore 2.3.0-rc62.3.0-rc6

Same product

traefik: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-88877Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
    37Monitor
  • CVE-2026-85595Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
    37Monitor
  • CVE-2026-88007Traefik HTTP/3 Backend NTLM Connection Reuse
    36Monitor
  • CVE-2026-88009Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
    35Monitor
  • CVE-2025-32431Traefik has a possible vulnerability with the path matchers
    35Monitor
  • CVE-2023-54365Traefik - Denial of Service via HTTP/2 Request Handling
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go:github.com/containous/traefik1.7.26Package registry (OSV)
Go:github.com/containous/traefik/api1.7.26Package registry (OSV)
Go:github.com/containous/traefik/v22.2.8Package registry (OSV)
Go:github.com/containous/traefik/v22.3.0-rc3Package registry (OSV)
Go:github.com/containous/traefik/v2/pkg/api2.2.8Package registry (OSV)
Go:github.com/containous/traefik/v2/pkg/api2.3.0-rc3Package registry (OSV)
Go:github.com/traefik/traefik1.7.26Package registry (OSV)
Go:github.com/traefik/traefik/api1.7.26Package registry (OSV)
Go:github.com/traefik/traefik/v22.3.0-rc6Package registry (OSV)
Go:github.com/traefik/traefik/v2/pkg/api2.3.0-rc6Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Nuclei detection template ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Nuclei detection templateNuclei template CVE-2020-15129 —

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records