CVE-2026-33741
EspoCRM: Stored XSS via SVG attachment loading same-origin JavaScript
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.
INFO
Published Date :
May 19, 2026, 6:14 p.m.
Last Modified :
May 19, 2026, 6:14 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-33741
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update EspoCRM to version 9.3.4 or later.
- Ensure Content Security Policy (CSP) is correctly configured.
- Review attachment handling and upload mechanisms.
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CVE-2026-33741 vulnerability anywhere in the article.