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CVE-2026-40496

Freescout vulnerability

9.1 CRITICALPublic exploitEPSS 0.55%
  1. Published21 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Freescout< 1.8.213

Remediation

Fixed in
Freescout≥ 1.8.213

References

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Frequently asked

Is CVE-2026-40496 being actively exploited?

CVE-2026-40496 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.55%.

How severe is CVE-2026-40496?

CVE-2026-40496 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.55% probability of exploitation.

Which products are affected by CVE-2026-40496?

Affected products include Freescout.

How do I fix CVE-2026-40496?

Upgrade affected software to a fixed version, for example Freescout 1.8.213 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40496 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.