Medium severity · published May 19, 2026
CVE-2026-33741
EspoCRM: Stored XSS via SVG attachment loading same-origin JavaScript
6.8
CVSS
0.2%
EPSS
No
On KEV
Description
EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below allow authenticated users to upload SVG attachments through normal attachment-capable fields and later serve those SVG files as top-level inline documents through both the attachment and image entry points, resulting in stored cross-user XSS reachable through a normal attachment workflow. Although inline SVG script is blocked by the response CSP, the same CSP still allows same-origin external script. As a result, an attacker can upload a malicious SVG together with a second attacker-controlled JavaScript attachment, then trick another user into opening the SVG to execute JavaScript in the victim's EspoCRM origin. This issue has been fixed in version 9.3.4.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ES
espocrm · espocrm
< 9.3.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33741
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33741
github.com
https://github.com/espocrm/espocrm/security/advisories/GHSA-5wh5-ccv2-m3pv
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EspoCRM is a free, open-source customer relationship management platform
