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Fencer Intel
medium 6.1

CVE-2020-15129 json

Open redirect in Traefik

published 6y ago modified 4mo ago also GHSA-6qq8-5wq3-86rp , EUVD-2022-0869

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
8.0%
EPSS 8.0% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Patch / fix

  • go github.com/traefik/traefik 1.7.26
  • go github.com/traefik/traefik/v2 2.3.0-rc6
  • go github.com/containous/traefik 1.7.26
  • go github.com/containous/traefik/v2 2.2.8, 2.3.0-rc3
  • go github.com/traefik/traefik/api 1.7.26
  • go github.com/traefik/traefik/v2/pkg/api 2.3.0-rc6
  • go github.com/containous/traefik/api 1.7.26
  • go github.com/containous/traefik/v2/pkg/api 2.2.8, 2.3.0-rc3
  • traefik traefik 1.7.26, 2.2.8
  • traefik Alpine 3.24, Alpine 3.23, Alpine 3.22 +6 more 2.2.8-r0

alpine advisories ALPINE-CVE-2020-15129

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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Exploit prediction

8.01% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N
NVD 3.1 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.0 AV:N/AC:H/Au:N/C:P/I:P/A:N
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/traefik/traefik
>=1.5.0-rc5, <1.7.26
1.7.26
go github.com/traefik/traefik/v2
<2.3.0-rc6
>=2.3.0-rc1, <2.3.0-rc6
2.3.0-rc6
go github.com/containous/traefik
>=1.5.0-rc5, <1.7.26
1.7.26
go github.com/containous/traefik/v2
<2.2.8
>=2.3.0-rc1, <2.3.0-rc3
2.2.8
2.3.0-rc3
go github.com/traefik/traefik/api
>=1.5.0-rc5, <1.7.26
1.7.26
go github.com/traefik/traefik/v2/pkg/api
<2.3.0-rc6
>=2.3.0-rc1, <2.3.0-rc6
2.3.0-rc6
go github.com/containous/traefik/api
>=1.5.0-rc5, <1.7.26
1.7.26
go github.com/containous/traefik/v2/pkg/api
<2.2.8
>=2.3.0-rc1, <2.3.0-rc3
2.2.8
2.3.0-rc3

Affected products

  • containous traefik

Classification

Weakness
  • CWE-601 URL Redirection to Untrusted Site

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.