CVE-2026-35584CWE-306CWE-639

FreeScout has an Unauthenticated IDOR in Open Tracking Endpoint Allows Cross-Conversation Thread Manipulation and Enumeration

Medium · published April 7, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
27.3
In the wild
Unconfirmed
What it is

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to 1.8.212, the endpoint GET /thread/read/{conversation_id}/{thread_id} does not require authentication and does not validate whether the given thread_id belongs to the given conversation_id. This allows any unauthenticated attacker to mark any thread as read by passing arbitrary IDs, enumerate valid thread IDs via HTTP response codes (200 vs 404), and manipulate opened_at timestamps across conversations (IDOR). This vulnerability is fixed in 1.8.212.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00350 · 27.3th percentile
Weaknesses
CWE-306 · Missing Authentication for Critical Function; CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-04-07T16:07Z
EPSS history
Timeline
  • 07 APR 16:07Z
    FreeScout has an Unauthenticated IDOR in Open Tracking Endpoint Allows Cross-Conversation Thread Manipulation and Enumeration
    cvelistv5