CVE-2026-40496

Summary

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 Software

Weaknesses

• CWE-330: CWE-330: Use of Insufficiently Random Values
• CWE-340: CWE-340: Generation of Predictable Numbers or Identifiers

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-2783-wxmm-wmwr
• https://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c70f0b61b9de9cd555
• https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213

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