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CVE-2026-35584

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

Published: Apr 7, 2026Updated: Apr 16, 2026 Sources: CVE List NVDCWE-306
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 78.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-306CWE-639

Affected Products

freescoutfreescout-help-desk
On-premWeb App
Enterprise Software / itsm-monitoring
freescoutfreescout
Mixed
Enterprise Software / itsm-monitoring
freescout-help-deskcommercialEnterprise Software
freescoutcommercialEnterprise Softwareaka freescout

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

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

Timeline

Published
Apr 7, 2026
Last Updated
Apr 16, 2026

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