CVE-2026-59994

MEDIUM 4.3

EspoCRM: Pre-authentication stored HTML injection in stream notification emails about email received

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

EspoCRM is an open source customer relationship management application. Prior to 9.3.9, an unauthenticated remote attacker can send an email to a monitored group or IMAP address, including an email-to-Case address, and place arbitrary HTML in its plain-text body. EspoCRM stores that body and renders it without escaping in Email Received stream notification emails sent to users following the related record, allowing HTML injection and, in mail clients that execute it, JavaScript execution. Earlier sanitization for Post and Mention notifications did not cover this notification path. This issue is fixed in version 9.3.9.

CWE	CWE-79
Vendor	espocrm
Product	espocrm
Published	Oct 15, 2026

Stay Ahead of the Next One

Get instant alerts for espocrm espocrm

Be the first to know when new medium vulnerabilities affecting espocrm espocrm are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

espocrm / espocrm

< 9.3.9

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/espocrm/espocrm/security/advisories/GHSA-3rh4-9hcq-g79m github.com: https://github.com/espocrm/espocrm/commit/f9fd47622df04617728643b4b8f1a22563cbc6e7 github.com: https://github.com/espocrm/espocrm/releases/tag/9.3.9