What’s Vulnerable › Vulnerabilities

CVE-2026-118658: Echo: Arbitrary Scheme Injection in WWWRedirect/NonWWWRedirect Middlewares via X-Forwarded-Proto

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-28 · updated 2026-10-29
• Weakness: CWE-601

Description

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 products

• labstack echo: from 5.0.0, < 5.1.1; before 4.15.2

References

• https://github.com/labstack/echo/commit/ca4f38a474302aabee93c66bdd0052359882e181
• https://github.com/labstack/echo/commit/d1d8ad3f99dd9b80542cd0c357d56a8916c515df
• https://github.com/labstack/echo/releases/tag/v4.15.2
• https://github.com/labstack/echo/releases/tag/v5.1.1
• https://github.com/labstack/echo/security/advisories/GHSA-23wf-92cp-8pcj

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