CVE-2026-118658
Echo: Arbitrary Scheme Injection in WWWRedirect/NonWWWRedirect Middlewares via X-Forwarded-Proto
CVSS Score
4.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-601 |
| Vendor | labstack |
| Product | echo |
| Published | Oct 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
labstack / echo
>= 5.0.0, < 5.1.1 < 4.15.2
References
github.com: https://github.com/labstack/echo/security/advisories/GHSA-23wf-92cp-8pcj github.com: https://github.com/labstack/echo/commit/ca4f38a474302aabee93c66bdd0052359882e181 github.com: https://github.com/labstack/echo/commit/d1d8ad3f99dd9b80542cd0c357d56a8916c515df github.com: https://github.com/labstack/echo/releases/tag/v4.15.2 github.com: https://github.com/labstack/echo/releases/tag/v5.1.1