CVE-2026-33741 EspoCRM: Stored XSS via SVG attachment loading same-origin JavaScript
Authenticated attackers can execute arbitrary JavaScript in victims' browsers by uploading malicious SVG and JS attachments, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-33741?
CVE-2026-33741 is a medium-severity cross-site scripting vulnerability in espocrm, published on 19 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-33741?
How do I fix CVE-2026-33741?
No fix has been published for CVE-2026-33741 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-33741 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33741 exists.
Sources
Also known as GHSA-5wh5-ccv2-m3pv.