CVE-2026-33741
MediumCVSS 6.8Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
EspoCRM 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, resulting in stored cross-user XSS. Although inline SVG script is blocked by CSP, same-origin external script is allowed, so an attacker can upload a malicious SVG together with a second attacker-controlled JavaScript attachment and trick another user into opening the SVG to execute JavaScript.
Risk Assessment
An attacker can execute arbitrary JavaScript in the victim's context, potentially leading to session theft, account takeover, or data theft.
Recommendation
Update EspoCRM to version 9.3.4 or later.
Original NVD description (English source)
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.