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TI-2026-82184 Aliases CVE-2026-118266GHSA-r7w9-592q-9vg4

CSRF bypass in Echo via MethodOverride rewriting POST requests

Priority MEDIUM 57CWE-352Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Tampering
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-352.

Summary

Echo, a Go web framework, is affected before 4.16.0 and from 5.0.0 before 5.4.0. When MethodOverride is registered before CSRF, it rewrites a POST to a safe method, so CSRF skips its token and Sec-Fetch-Site checks (CWE-352). A cross-site attacker can exploit this against an authenticated victim when the override value comes from a form getter that a browser-submitted form can set.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00163 5th percentileScored 2026-11-07
Fix Fixed echo (labstack): 4.16.0, 5.4.0github.com/labstack/echo/v5 (Go): 5.4.0+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
labstackechobefore 4.16.0; 5.0.0 to before 5.4.04.16.0, 5.4.0Patch availableCNA
—github.com/labstack/echo/v5 (Go)5.0.0 to before 5.4.05.4.0Patch availableGHSA-r7w9-592q-9vg4
—github.com/labstack/echo/v4 (Go)before 4.16.04.16.0Patch availableGHSA-r7w9-592q-9vg4
  • echo Vendorlabstack Affected before 4.16.0; 5.0.0 to before 5.4.0 Fixed in 4.16.0, 5.4.0 Patch available CNA
  • github.com/labstack/echo/v5 (Go) Vendor— Affected 5.0.0 to before 5.4.0 Fixed in 5.4.0 Patch available GHSA-r7w9-592q-9vg4
  • github.com/labstack/echo/v4 (Go) Vendor— Affected before 4.16.0 Fixed in 4.16.0 Patch available GHSA-r7w9-592q-9vg4

Remediation

Upgrade the github.com/labstack/echo/v4 module to 4.16.0 and the github.com/labstack/echo/v5 module to 5.4.0.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA echo (labstack) Fixed in 4.16.0, 5.4.0
  • Fix · GHSA-r7w9-592q-9vg4 github.com/labstack/echo/v5 (Go) Fixed in 5.4.0 Advisory →
  • Fix · GHSA-r7w9-592q-9vg4 github.com/labstack/echo/v4 (Go) Fixed in 4.16.0 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-118266
  2. 2026-10-28 Alias added: GHSA-r7w9-592q-9vg4
  3. 2026-10-28 Fix available: Go/github.com/labstack/echo/[email protected], Go/github.com/labstack/echo/[email protected] · GHSA-r7w9-592q-9vg4
  4. 2026-10-28 CVSS score added · GHSA-r7w9-592q-9vg4
  5. 2026-10-28 Weakness changed · GHSA-r7w9-592q-9vg4
  6. 2026-10-28 6 new references · GHSA-r7w9-592q-9vg4
  7. 2026-11-03 CISA SSVC decision points changed
  8. 2026-11-03 Priority changed: LOW → MEDIUM
  9. 2026-11-06 Affected versions changed · Red Hat
  10. 2026-11-06 CVSS score added · Red Hat

References

Other 6

  • TI-2022-18981 Labstack Echo v4.8.0 was discovered to contain an open redirect vulnerability via the… CVSS 3.1CRITICAL 9.6
  • TI-2026-82185 Path decoding mismatch in Echo middleware.Static exposes static files CVSS 3.1HIGH 7.5
  • TI-2026-40198 Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files CVSS 3.1HIGH 7.5
  • TI-2026-82194 Rate limiter bypass in Echo via spoofed X-Forwarded-For header CVSS 3.1MEDIUM 5.3
  • TI-2026-20833 Echo has a Windows path traversal via backslash in middleware.Static default filesystem CVSS 3.1MEDIUM 5.3
  • TI-2020-18793 Directory traversal on Windows in github.com/labstack/echo/v4 CVSS 3.1MEDIUM 5.3
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences