What is CVE-2026-59994?

CVE-2026-59994 is a medium-severity vulnerability in Espocrm, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-10-15.

How severe is CVE-2026-59994?

Medium severity. CVSS v3 base score is 4.3 out of 10.

XSS in Espocrm

CVE-2026-59994

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-15 · last modified 2026-10-15.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Espocrm — versions < 9.3.9

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-59994?: CVE-2026-59994 is a medium-severity vulnerability in Espocrm, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-10-15.
How severe is CVE-2026-59994?: Medium severity. CVSS v3 base score is 4.3 out of 10.