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CVE-2026-33741— EspoCRM: Stored XSS via SVG attachment loading same-origin JavaScript

CVSS 6.8 · Medium EPSS 0.04% · P12

Affected Version Matrix 1

VendorProductVersion RangeStatus
espocrmespocrm< 9.3.4affected
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I. Basic Information for CVE-2026-33741

Vulnerability Information
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Vulnerability Title
EspoCRM: Stored XSS via SVG attachment loading same-origin JavaScript
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
EspoCRM 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
EspoCRM是EspoCRM开源的一套开源的基于Web的客户关系管理系统（CRM）。该系统提供销售自动化、社区和客户支持等功能。 EspoCRM 9.3.3及之前版本存在跨站脚本漏洞，该漏洞源于允许上传SVG附件并通过附件和图像入口点提供，导致存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
espocrmespocrm < 9.3.4 -

II. Public POCs for CVE-2026-33741

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III. Intelligence Information for CVE-2026-33741

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Vendor Advisories for CVE-2026-33741 (1)

IV. Related Vulnerabilities

Same product: espocrm
Same vendor: espocrm
Same weakness: CWE-79

V. Comments for CVE-2026-33741

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