CVE-2026-35584

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

State: Published
Severity: 6.9 Medium
Published: Apr 7, 2026
Updated: Apr 9, 2026
Reserved: Apr 3, 2026

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Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	GitHub_M

Weaknesses

CWE-306 Missing Authentication for Critical Function
CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
freescoutfreescout-help-desk	< 1.8.212Affected

References

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-873c-r7v5-g98v

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