What is CVE-2026-35584?

CVE-2026-35584 is a medium-severity vulnerability in Freescout, classified under Missing Authentication for Critical Function. CVSS score: 6.5/10. Published 2026-04-07.

How severe is CVE-2026-35584?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2026-35584 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Freescout

CVE-2026-35584

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.

Vulnerability class: Broken Authentication

EPSS: 0.003 (22.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Freescout
Freescout-help-desk Freescout — versions < 1.8.212

Weakness classification (CWE)

Public proof-of-concept exploits

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-35584?: CVE-2026-35584 is a medium-severity vulnerability in Freescout, classified under Missing Authentication for Critical Function. CVSS score: 6.5/10. Published 2026-04-07.
How severe is CVE-2026-35584?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2026-35584 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.