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GHSA-RGJ7-VG8V-J4WR: GHSA-RGJ7-VG8V-J4WR: Unauthenticated Engagement Metric Inflation in Ech0

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GHSA-RGJ7-VG8V-J4WR: Unauthenticated Engagement Metric Inflation in Ech0

Vulnerability ID: GHSA-RGJ7-VG8V-J4WR
CVSS Score: 5.3
Published: 2026-05-07

The Ech0 lightweight publishing platform suffers from a missing authentication check (CWE-306) and missing authorization (CWE-862) on the PUT /api/echo/like/:id API endpoint. This vulnerability allows an unauthenticated remote attacker to arbitrarily inflate engagement metrics by repeatedly sending requests, falsifying social proof and generating unnecessary database writes.

TL;DR

A critical API endpoint in the Ech0 publishing platform was exposed publicly without authentication or user-binding checks. Remote attackers can leverage this to artificially inflate the "like" count of any post via repeated HTTP requests.

⚠️ Exploit Status: POC

Technical Details

  • CWE ID: CWE-306 / CWE-862
  • Attack Vector: Network
  • CVSS Base Score: 5.3 (Medium)
  • Impact: Integrity Loss (Engagement Manipulation)
  • Exploit Status: Proof of Concept Available
  • Authentication: None Required

Affected Systems

  • github.com/lin-snow/ech0 implementations prior to version 1.4.8-0.20260503040728-a7e8b8e84bd1
  • github.com/lin-snow/ech0: < 1.4.8-0.20260503040728-a7e8b8e84bd1 (Fixed in: 1.4.8-0.20260503040728-a7e8b8e84bd1)

Code Analysis

Commit: a7e8b8e

Fix commit for unauthenticated like endpoint vulnerability.

Exploit Details

  • Security Research / PoC Script: A provided bash script demonstrating iteration over the vulnerable endpoint to artificially inflate likes via repeated cURL commands.

Mitigation Strategies

  • Migrate the target endpoint to an authenticated routing group.
  • Implement stateful tracking of engagement metrics linking specific user IDs to specific resources.
  • Apply strict IP-based rate limiting on state-changing API endpoints.
  • Implement CORS policies to restrict cross-origin exploitation vectors.

Remediation Steps:

  1. Update the Ech0 application to version 1.4.8-0.20260503040728-a7e8b8e84bd1 or later.
  2. Verify that the PUT /api/echo/like/:id endpoint returns an HTTP 401 Unauthorized status when accessed without credentials.
  3. Review custom routing logic in internal forks to ensure no administrative or state-changing routes reside in the PublicRouterGroup.

References

Read the full report for GHSA-RGJ7-VG8V-J4WR on our website for more details including interactive diagrams and full exploit analysis.

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