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CVE-2026-40496

FreeScout has Predictable Attachment Token that Allows Unauthenticated Private File Download via Brute Force PUBLISHED

Description (CNA)

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, attachment download tokens are generated using a weak and predictable formula: `md5(APP_KEY + attachment_id + size)`. Since attachment_id is sequential and size can be brute-forced in a small range, an unauthenticated attacker can forge valid tokens and download any private attachment without credentials. Version 1.8.213 fixes the issue.

Affected (CNA)

Vendor / productVersions
freescout-help-desk / freescoutaffected < 1.8.213

CWE

CWE-330, CWE-340

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.