CVE-2026-40496CRITICAL 9.1EPSS p32.0%

CVE-2026-40496CVE-2026-40496

Description

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.40% probability of exploitation · percentile 32.0% · 2026-06-19T12:03:05Z
Published2026-04-21
Last modified2026-04-23

Underlying weaknesses· 2

CWE-330CWE-340

References

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

2

TypeTargetConfidenceTier
WeaknessUse of Insufficiently Random Valuescwe-3300%live
WeaknessGeneration of Predictable Numbers or Identifierscwe-3400%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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CVE-2026-47123
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CVE-2026-40497
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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.