Vulnerability · Published Oct 15, 2026 · Assigned by GitHub_M

CVE-2026-59994EspoCRM: Pre-authentication stored HTML injection in stream notification emails about email received

Medium 4.3

In plain English

A medium-severity cross-site scripting in espocrm from espocrm. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 71.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
espocrm	espocrm	< 9.3.9

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

References

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