Echo: Arbitrary Scheme Injection in WWWRedirect/NonWWWRedirect Middlewares via X-Forwarded-Proto

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-118658
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 21:16:55 UTC
Updated2026-10-28 21:16:55 UTC
DescriptionEcho 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.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

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

Problem Types: CWE-601 | CWE-601 CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.7MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED4.7MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Labstack Echo affected >= 5.0.0, < 5.1.1 Not specified
CNA Labstack Echo affected < 4.15.2 Not specified

References

ReferenceSourceLinkTags
github.com/labstack/echo/commit/ca4f38a474302aabee93c66bdd0052359882e181 [email protected] github.com
github.com/labstack/echo/releases/tag/v4.15.2 [email protected] github.com
github.com/labstack/echo/security/advisories/GHSA-23wf-92cp-8pcj [email protected] github.com
github.com/labstack/echo/releases/tag/v5.1.1 [email protected] github.com
github.com/labstack/echo/commit/d1d8ad3f99dd9b80542cd0c357d56a8916c515df [email protected] github.com
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