Cross-site scripting in EspoCRM - CVE-2026-55184
Published: July 28, 2026
Vulnerability identifier: #VU139911
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-55184
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 user to execute arbitrary JavaScript in another user's browser.
The vulnerability exists due to cross-site scripting in wysiwyg template fields when processing crafted HTML in Email Template or PDF Template content. A remote user can store malicious HTML in a template to execute arbitrary JavaScript in another user's browser.
User interaction is required when another user opens the template in edit mode. Only instances with Content Security Policy disabled (clientCspDisabled = true) are vulnerable to the full session hijacking scenario.
How to mitigate CVE-2026-55184
Install security update from vendor's website.