EUVD-2026-30967CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L
Lifecycle Timeline
2DescriptionNVD
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.
AnalysisAI
Stored cross-site scripting in EspoCRM 9.3.3 and below enables an authenticated attacker to execute arbitrary JavaScript in the browser session of any user who opens a crafted SVG attachment. The attack exploits EspoCRM's inline SVG serving behavior combined with a CSP misconfiguration that blocks inline scripts but permits same-origin external scripts - allowing a separately uploaded attacker-controlled JavaScript file (also hosted on the same EspoCRM origin) to be loaded and executed. …
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External POC / Exploit Code
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