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CVE-2026-40514

SmarterTools SmarterMail < Build 9610 Cryptographic Weakness via Weak RNG

Published: Apr 27, 2026Updated: Jun 4, 2026 Sources: CVE List NVDCWE-338
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.2%
Top 95.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

SmarterTools SmarterMail builds prior to 9610 contain a cryptographic weakness in the file and email sharing endpoints that use DES-CBC encryption with keys and initialization vectors derived from System.Random seeded with insufficient entropy, reducing the seed space to approximately 19,000 possible values. An unauthenticated attacker can use the attachment download endpoint as an oracle to determine the seed in use and derive encryption keys and initialization vectors to forge sharing tokens for arbitrary emails, attachments, or file storage contents without prior access to the targeted content.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-338

Affected Products

SmarterMailSmarterTools Inc.
Mixed
Communications / email-server-client
smartermailsmartertools
Mixed
Communications / email-server-client
smartertools inc.commercialCommunications
smartertoolscommercialCommunicationsaka smartermail, smarterstats, smartertrack

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://www.smartertools.com/smartermail/release-notes/current
smartertools.com
https://www.vulncheck.com/advisories/smartertools-smartermail-build-9610-cryptographic-weakness-via-weak-rng
vulncheck.com

Timeline

Published
Apr 27, 2026
Last Updated
Jun 4, 2026

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