Which versions of FreeScout are affected by CVE-2026-40496?

FreeScout versions prior to 1.8.213 contain a critical token generation flaw that allows unauthenticated attackers to download all private email attachments by predicting weak MD5-based security…. A patch is available.

How to fix or mitigate CVE-2026-40496?

Within 24 hours: identify all FreeScout deployments and document current versions. Within 7 days: apply vendor patch to FreeScout version 1.8.213 or later on all instances; verify patch installation and restart services. Within 30 days: conduct audit of attachment access logs (if available) to identify suspicious token-based downloads; notify customers or stakeholders if sensitive attachments were potentially exposed.

FreeScout CVE-2026-40496

Q: What is the CVSS score of CVE-2026-40496?

CVE-2026-40496 has a CVSS 4.0 base score of 8.8 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-24049 HIGH

Use of Insufficiently Random Values (CWE-330)

2026-04-21 GitHub_M

Information Disclosure

8.8

CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Patch released

Apr 23, 2026 - 16:32 nvd

Patch available

Re-analysis Queued

Apr 21, 2026 - 16:22 vuln.today

cvss_changed

Analysis Generated

Apr 21, 2026 - 04:29 vuln.today

Patch available

Apr 21, 2026 - 03:01 EUVD

CVSS changed

Apr 21, 2026 - 02:22 NVD

8.8 (HIGH)

EUVD ID Assigned

Apr 21, 2026 - 02:00 euvd

EUVD-2026-24049

Analysis Generated

Apr 21, 2026 - 02:00 vuln.today

CVE Published

Apr 21, 2026 - 01:38 nvd

HIGH 8.8

DescriptionNVD

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.

AnalysisAI

Insecure token generation in FreeScout <1.8.213 allows unauthenticated remote attackers to download private email attachments by forging MD5-based download tokens. The predictable formula (md5(APP_KEY + sequential_attachment_id + guessable_size)) enables enumeration of all stored attachments without credentials. …

RemediationAI

Within 24 hours: identify all FreeScout deployments and document current versions. Within 7 days: apply vendor patch to FreeScout version 1.8.213 or later on all instances; verify patch installation and restart services. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-40496 vulnerability details – vuln.today

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FreeScout CVE-2026-40496

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DescriptionNVD

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FreeScout CVE-2026-40496

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External POC / Exploit Code