What is CVE-2026-40496?

CVE-2026-40496 is a critical-severity vulnerability in Freescout, classified under Use of Insufficiently Random Values. CVSS score: 9.1/10. Published 2026-04-21.

How severe is CVE-2026-40496?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Freescout

CVE-2026-40496

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…

EPSS: 0.004 (32.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Freescout
Freescout-help-desk Freescout — versions < 1.8.213

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-40496?: CVE-2026-40496 is a critical-severity vulnerability in Freescout, classified under Use of Insufficiently Random Values. CVSS score: 9.1/10. Published 2026-04-21.
How severe is CVE-2026-40496?: Critical severity. CVSS v3 base score is 9.1 out of 10.