PT-2026-27633 · Ech0 · Ech0

Qiaonpc · CVE-2026-33638 · Published 2026-03-24 · Updated 2026-07-30

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Ech0 versions prior to 4.2.0

Description The GET /api/allusers API endpoint is publicly accessible, allowing remote unauthenticated user enumeration and exposure of user profile metadata. The route is registered under public routes in internal/router/user.go:17 and is called using appRouterGroup.PublicRouterGroup.GET("/allusers", h.UserHandler.GetAllUsers()). Despite API documentation indicating an authentication requirement (@Security ApiKeyAuth), the endpoint does not enforce it. This allows unauthorized access to user data, potentially enabling account reconnaissance and targeted credential attacks.

Recommendations Update Ech0 to version 4.2.0 or later.

Exploit

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-33638

GHSA-M983-7426-5HRJ

GO-2026-4838

OPENSUSE-SU-2026:21483-1

SUSE-SU-2026:1135-1

Affected Products

Ech0

References · 1748

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33638.json · Exploit
• https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681 · Patch
• https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:1135-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33638 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-m983-7426-5hrj · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33638 · Security Note
• https://osv.dev/vulnerability/GO-2026-4838 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:21483-1 · Vendor Advisory
• https://github.com/lin-snow/Ech0 · Note
• https://github.com/lin-snow/Ech0/releases/tag/v4.2.0 · Note
• https://suse.com/security/cve/CVE-2025-65797 · Note
• https://suse.com/security/cve/CVE-2026-44427 · Note
• https://suse.com/security/cve/CVE-2026-27589 · Note
• https://suse.com/security/cve/CVE-2026-7736 · Note