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CVE-2026-118266— Echo: CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method

Quick assessment

Affected
labstack echo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Echo 是一个基于 Go 语言的 Web 框架。在 4.16.0 和 5.4.0 版本之前，Echo 的 MethodOverride 中间件允许将安全的 HTTP 方法（如 GET）作为 POST 请求的覆盖目标。当 MethodOverride 在路由后的中间件链中注册于 CSRF 中间件之前时，路由选择仍保留原始的状态变更型 POST 处理器，但 MethodOverride 会在 CSRF 中间件进行验证之前将请求方法覆盖，从而导致 CSRF 令牌验证和 Sec-Fetch-Site 检查均被跳过。 要利

CVSS 5.3 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
labstack echo < 4.16.0 affected
>= 5.0.0, < 5.4.0 affected
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I. Basic Information for CVE-2026-118266

Vulnerability Information
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Vulnerability Title
Echo: CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method
Source: CVE Program / CVE List V5
Vulnerability Description
Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Echo's MethodOverride middleware accepts a safe HTTP method as the override target for a POST request. When MethodOverride is registered before CSRF in the post-routing middleware chain, route selection retains the original state-changing POST handler but the override changes the method before CSRF evaluates it, causing both token validation and Sec-Fetch-Site checks to be skipped. A cross-site exploit requires an authenticated victim and an override value that a browser-submitted request can control, such as the form getter used by the advisory reproducer; the default X-HTTP-Method-Override header getter is not settable by a cross-site form. This issue is fixed in 4.16.0 and 5.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
labstack echo < 4.16.0 -

II. Public POCs for CVE-2026-118266

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III. Intelligence Information for CVE-2026-118266

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Other References for CVE-2026-118266 (5)

Same Patch Batch · labstack · 2026-10-28 · 16 CVEs total

CVE-2026-118264 9.1 CRITICAL Echo: Rejected WebSocket upgrades can bypass Echo route-level access controls
CVE-2026-118260 8.2 HIGH Echo: BodyDump captures request and response bodies without size limits in v4
CVE-2026-118262 8.2 HIGH Echo: WebSocket proxy can retain connections and handlers after client disconnect
CVE-2026-118261 8.2 HIGH Echo: Decompress permits unbounded gzip expansion in v4
CVE-2026-118650 7.5 HIGH Echo: middleware.Static: `%2F`-encoded path bypasses route/group middleware guarding a sta
CVE-2026-118263 6.3 MEDIUM Echo: BodyDump can discard BodyLimit overflow errors for unknown-length requests
CVE-2026-118652 6.1 MEDIUM Echo: Reflected Cross-Site Scripting (XSS) via unsanitized JSONP callback in Context.JSONP
CVE-2026-118656 6.1 MEDIUM Echo: Open Redirect via Control-Character Prefix Defeating sanitizeURI
CVE-2026-118654 5.9 MEDIUM Echo static file middleware route protection bypass via encoded dot-dot traversal
CVE-2026-118655 5.9 MEDIUM Echo: Static Middleware Double-Unescape Path Traversal
CVE-2026-118657 5.9 MEDIUM Echo: HTTPS Redirect and HSTS Bypass via Unconditional Trust of Forwarded Scheme Headers
CVE-2026-118651 5.3 MEDIUM Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default
CVE-2026-118265 5.3 MEDIUM Echo: X-Real-IP extractor trusts the header value instead of the sending peer
CVE-2026-118653 5.3 MEDIUM Echo: Rate Limiter Bypass via Spoofed X-Forwarded-For Header in Default Configuration
CVE-2026-118658 4.7 MEDIUM Echo: Arbitrary Scheme Injection in WWWRedirect/NonWWWRedirect Middlewares via X-Forwarded

IV. Related Vulnerabilities

Same product: echo
Same vendor: labstack
Same weakness: CWE-352