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TI-2026-82199 Aliases CVE-2026-118658GHSA-23wf-92cp-8pcj

Arbitrary scheme injection in Echo WWWRedirect and NonWWWRedirect

Priority MEDIUM 55CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-601.

Summary

Echo, a Go web framework, is affected from 5.0.0 before 5.1.1 and before 4.15.2. Context.Scheme accepts the X-Forwarded-Proto, X-Forwarded-Protocol and X-Url-Scheme headers without checking that they are supported web schemes (CWE-601). WWWRedirect and NonWWWRedirect build the Location header from that value, so an attacker who controls a forwarded scheme header can make a redirect use an arbitrary URI scheme, provided a user interacts with the response.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Echo is a Go web framework. Prior to 4.15.2 and 5.1.1, Context.Scheme returns values from X-Forwarded-Proto, X-Forwarded-Protocol, or X-Url-Scheme without validating that they are supported web schemes. WWWRedirect and NonWWWRedirect use that value to construct a Location header, so an attacker controlling a forwarded scheme header can cause a redirect to use an arbitrary URI scheme. Exploitation requires an affected redirect middleware and user interaction with the response; the HTTPS-specific redirect variants hardcode HTTPS and are unaffected. This issue is fixed in 4.15.2 and 5.1.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00186 8th percentileScored 2026-11-07
Fix Fixed echo (labstack): 5.1.1, 4.15.2github.com/labstack/echo/v5 (Go): 5.1.1+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
labstackecho5.0.0 to before 5.1.1; before 4.15.25.1.1, 4.15.2Patch availableCNA
—github.com/labstack/echo/v5 (Go)before 5.1.15.1.1Patch availableGHSA-23wf-92cp-8pcj
—github.com/labstack/echo/v4 (Go)before 4.15.24.15.2Patch availableGHSA-23wf-92cp-8pcj
  • echo Vendorlabstack Affected 5.0.0 to before 5.1.1; before 4.15.2 Fixed in 5.1.1, 4.15.2 Patch available CNA
  • github.com/labstack/echo/v5 (Go) Vendor— Affected before 5.1.1 Fixed in 5.1.1 Patch available GHSA-23wf-92cp-8pcj
  • github.com/labstack/echo/v4 (Go) Vendor— Affected before 4.15.2 Fixed in 4.15.2 Patch available GHSA-23wf-92cp-8pcj

Remediation

Upgrade github.com/labstack/echo/v4 to 4.15.2 and github.com/labstack/echo/v5 to 5.1.1. The fixed versions are 4.15.2 for the v4 line and 5.1.1 for the v5 line.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA echo (labstack) Fixed in 5.1.1, 4.15.2
  • Fix · GHSA-23wf-92cp-8pcj github.com/labstack/echo/v5 (Go) Fixed in 5.1.1 Advisory →
  • Fix · GHSA-23wf-92cp-8pcj github.com/labstack/echo/v4 (Go) Fixed in 4.15.2 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-118658
  2. 2026-10-28 Alias added: GHSA-23wf-92cp-8pcj
  3. 2026-10-28 Fix available: Go/github.com/labstack/echo/[email protected], Go/github.com/labstack/echo/[email protected] · GHSA-23wf-92cp-8pcj
  4. 2026-10-28 CVSS score added · GHSA-23wf-92cp-8pcj
  5. 2026-10-28 Weakness changed · GHSA-23wf-92cp-8pcj
  6. 2026-10-28 7 new references · GHSA-23wf-92cp-8pcj
  7. 2026-11-02 CISA SSVC decision points changed
  8. 2026-11-02 Priority changed: LOW → MEDIUM
  9. 2026-11-06 Affected versions changed · Red Hat
  10. 2026-11-06 CVSS score added · Red Hat

References

Other 7

  • TI-2022-18981 Labstack Echo v4.8.0 was discovered to contain an open redirect vulnerability via the… CVSS 3.1CRITICAL 9.6
  • TI-2026-82185 Path decoding mismatch in Echo middleware.Static exposes static files CVSS 3.1HIGH 7.5
  • TI-2026-40198 Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files CVSS 3.1HIGH 7.5
  • TI-2026-82194 Rate limiter bypass in Echo via spoofed X-Forwarded-For header CVSS 3.1MEDIUM 5.3
  • TI-2026-20833 Echo has a Windows path traversal via backslash in middleware.Static default filesystem CVSS 3.1MEDIUM 5.3
  • TI-2020-18793 Directory traversal on Windows in github.com/labstack/echo/v4 CVSS 3.1MEDIUM 5.3
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences