CVE-2026-48020

CRITICALNVD 10.010.0
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 10.0 from GitHub Security Advisory (severity: HIGH) published 2026-06-11. NVD baseline CVSS 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2026-38574 (ENISA EUVD) · GHSA-xf64-8mw2-4gr2 (GitHub Security Advisories)Source: ENISA EUVD

10.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 10.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity100% × 45%
Impact severity (EG Severity): CVSS 10.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.8% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.8%
EPSS %ILE
55th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.

EG Severity
10.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.8% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 11, 2026

Last Modified

September 2, 2026

Advisory Details (8)

Auto-updated Oct 30, 2026
Patch available. Sources: github_release, github, redhat.
Red Hat

2491915 – (CVE-2026-48020) CVE-2026-48020 github.com/traefik/traefik: Traefik: Authentication bypass in StripPrefix middleware allows unauthorized access to protected paths

https://bugzilla.redhat.com/show_bug.cgi?id=2491915
Red HatMentions a patch (unverified)

CVE-2026-48020 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-48020
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:62260
GitHub advisoryMentions a patch (unverified)

Traefik StripPrefix Route-Level Auth Bypass via Path Normalization · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-xf64-8mw2-4gr2
GitHub release Patch Available

v3.7.3

Patch available: traefik/traefik v3.7.3

https://github.com/traefik/traefik/releases/tag/v3.7.3
GitHub release Patch Available

v3.6.19

Patch available: traefik/traefik v3.6.19

https://github.com/traefik/traefik/releases/tag/v3.6.19
GitHub release Patch Available

v2.11.48

Patch available: traefik/traefik v2.11.48

https://github.com/traefik/traefik/releases/tag/v2.11.48

Vendor Advisories for CVE-2026-48020(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatdevspaces/traefik-rhel9:17877567992026-09-01redhat
gogithub.com/traefik/traefik/v2 @ 2.11.48 (fixes < 2.11.48)—ghsa
gogithub.com/traefik/traefik/v3 @ 3.6.19 (fixes < 3.6.19)—ghsa
gogithub.com/traefik/traefik/v3 @ 3.7.3 (fixes >= 3.7.0-ea.1, < 3.7.3)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 1 ecosystem)
Go(3)
PackageVulnerable rangeFix by version rangeDependents
github.com/traefik/traefik—
  • every version on: no fix on record
—
github.com/traefik/traefik/v2—
  • every version up to 2.11.48: fixed in 2.11.48
—
github.com/traefik/traefik/v3—
  • every version up to 3.6.19: fixed in 3.6.19
  • 3.7.0-ea.1 up to 3.7.3: fixed in 3.7.3
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 22× in last 7d / 77× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 207 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 107 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 05:44 UTCEG score recompute
  2. 2026-11-02 05:44 UTCVendor advisory
  3. 2026-11-02 05:44 UTCGHSA enrichmentGHSA-xf64-8mw2-4gr2 · GitHub severity HIGH · GitHub CVSS 10.0
  4. 2026-11-01 07:47 UTCEG score recompute
  5. 2026-11-01 07:47 UTCGHSA enrichmentGHSA-xf64-8mw2-4gr2 · GitHub severity HIGH · GitHub CVSS 10.0
  6. 2026-11-01 04:38 UTCEG score recompute
  7. 2026-11-01 04:38 UTCVendor advisory
  8. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  9. 2026-10-31 03:32 UTCEG score recompute
  10. 2026-10-31 03:32 UTCVendor advisory
  11. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  12. 2026-10-30 02:26 UTCEG score recompute
  13. 2026-10-30 02:26 UTCVendor advisory
  14. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  15. 2026-10-29 01:20 UTCEG score recompute
  16. 2026-10-29 01:20 UTCVendor advisory
  17. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  18. 2026-10-28 00:13 UTCEG score recompute
  19. 2026-10-28 00:13 UTCVendor advisory
  20. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  21. 2026-10-26 23:05 UTCEG score recompute
  22. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  23. 2026-10-25 18:36 UTCEG score recompute
  24. 2026-10-25 18:36 UTCVendor advisory
  25. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
Show 75 more
  1. 2026-10-25 14:23 UTCEG score recompute
  2. 2026-10-24 17:28 UTCEG score recompute
  3. 2026-10-24 17:28 UTCVendor advisory
  4. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  5. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  6. 2026-10-23 16:21 UTCEG score recompute
  7. 2026-10-23 16:21 UTCVendor advisory
  8. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  9. 2026-10-22 15:14 UTCEG score recompute
  10. 2026-10-22 15:14 UTCVendor advisory
  11. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  12. 2026-10-21 14:07 UTCEG score recompute
  13. 2026-10-21 14:07 UTCVendor advisory
  14. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  15. 2026-10-20 12:56 UTCEG score recompute
  16. 2026-10-20 12:56 UTCVendor advisory
  17. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  18. 2026-10-19 11:47 UTCEG score recompute
  19. 2026-10-19 11:47 UTCVendor advisory
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  21. 2026-10-18 09:46 UTCVendor advisory
  22. 2026-10-18 03:35 UTCEG score recompute
  23. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  24. 2026-10-17 08:37 UTCEG score recompute
  25. 2026-10-17 08:37 UTCVendor advisory
  26. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  27. 2026-10-16 07:30 UTCEG score recompute
  28. 2026-10-16 07:30 UTCVendor advisory
  29. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  30. 2026-10-15 06:23 UTCEG score recompute
  31. 2026-10-15 06:23 UTCVendor advisory
  32. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  33. 2026-10-14 02:04 UTCEG score recompute
  34. 2026-10-14 02:04 UTCVendor advisory
  35. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  36. 2026-10-12 22:22 UTCEG score recompute
  37. 2026-10-12 22:22 UTCVendor advisory
  38. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  39. 2026-10-12 16:01 UTCEG score recompute
  40. 2026-10-12 07:28 UTCVendor advisory
  41. 2026-10-11 19:44 UTCEG score recompute
  42. 2026-10-11 16:58 UTCEG score recompute
  43. 2026-10-11 14:23 UTCEG score recompute
  44. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  45. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  46. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  47. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  48. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  49. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  50. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  51. 2026-10-03 18:21 UTCOSV refresh
  52. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  53. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  54. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  55. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  56. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  57. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  58. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  59. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  60. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  61. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  62. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  63. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  64. 2026-09-14 08:35 UTCVendor advisory
  65. 2026-09-14 04:10 UTCEG score recompute
  66. 2026-09-14 04:10 UTCVendor advisory
  67. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  68. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  69. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  70. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  71. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  72. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  73. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  74. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
  75. 2026-09-02 13:37 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-48020?
CVE-2026-48020 is a critical-severity vulnerability; its CVE record was published on June 11, 2026. 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…
When was the CVE record for CVE-2026-48020 published?
The CVE record for CVE-2026-48020 was published on June 11, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 2, 2026; the record at its source may have been updated since.
Is CVE-2026-48020 actively exploited?
CVE-2026-48020 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (55th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48020?
CVE-2026-48020 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-48020?
A fix for CVE-2026-48020 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-48020 are linked in the Vendor Advisories panel on this page.

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