CVE-2026-59994CWE-79cross-site-scripting

CVE-2026-59994

Medium · published October 15, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
26.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00345 · 26.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-15T19:17Z
References (3)
https://github.com/espocrm/espocrm/commit/f9fd47622df04617728643b4b8f1a22563cbc6e7 · [email protected]https://github.com/espocrm/espocrm/releases/tag/9.3.9 · [email protected]https://github.com/espocrm/espocrm/security/advisories/GHSA-3rh4-9hcq-g79m · [email protected]
EPSS history
Timeline
  • 17 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 15 OCT 14:50Z
    EspoCRM: Pre-authentication stored HTML injection in stream notification emails about email received
    cvelistv5
  • 15 OCT 14:50Z
    EspoCRM: Pre-authentication stored HTML injection in stream notification emails about email received
    cvelistv5