Open Redirect in Labstack Echo
CVE-2026-118658
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.
Vulnerability class: Open Redirect
Published .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Labstack Echo — versions < 4.15.2, >= 5.0.0, < 5.1.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-118658?
- CVE-2026-118658 is a medium-severity vulnerability in Labstack Echo, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.7/10. Published 2026-10-28.
- How severe is CVE-2026-118658?
- Medium severity. CVSS v3 base score is 4.7 out of 10.