Cross-site scripting in EspoCRM - CVE-2026-59994
Published: July 28, 2026
Vulnerability identifier: #VU139910
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-59994
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: EspoCRM
Affected software:
EspoCRM
EspoCRM
Detailed vulnerability description
The vulnerability allows a remote attacker to inject arbitrary HTML into notification emails.
The vulnerability exists due to improper neutralization of input during web page generation in the "Email Received" stream notification email handling when rendering stored email body content into HTML notifications. A remote attacker can send a specially crafted email to a monitored address to inject arbitrary HTML into notification emails.
Depending on the recipient's mail client, injected content may include executable JavaScript. User interaction is required to view the crafted notification email.
How to mitigate CVE-2026-59994
Install security update from vendor's website.