Medium severity · published Oct 15, 2026
CVE-2026-59994
EspoCRM: Pre-authentication stored HTML injection in stream notification emails about email received
4.3
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ES
espocrm · espocrm
< 9.3.9 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59994
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59994
github.com
https://github.com/espocrm/espocrm/commit/f9fd47622df04617728643b4b8f1a22563cbc6e7
github.com
https://github.com/espocrm/espocrm/releases/tag/9.3.9
github.com
https://github.com/espocrm/espocrm/security/advisories/GHSA-3rh4-9hcq-g79m
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EspoCRM is a free, open-source customer relationship management platform