CVE-2026-118658
Echo: Arbitrary Scheme Injection in WWWRedirect/NonWWWRedirect Middlewares via X-Forwarded-Proto
MEDIUM 4.7EPSS 0.2%
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.
- Affected
- labstack · echo
- CVSS v3.1 GITHUB
- 4.7 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N - EPSS
- 0.19% chance of exploitation in the next 30 days, 8th percentile
- Published
- 2026-10-28
- Updated
- 2026-11-02
Proof-of-concept exploits (1)
CVE references
- labstack/echo/commit/ca4f38a474302aabee93c66bdd0052359882e181REFERENCE
- labstack/echo/commit/d1d8ad3f99dd9b80542cd0c357d56a8916c515dfREFERENCE
- labstack/echo/releases/tag/v4.15.2REFERENCE
- labstack/echo/releases/tag/v5.1.1REFERENCE
- labstack/echo/security/advisories/GHSA-23wf-92cp-8pcjREFERENCE