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CVE-2026-40507— OpenEMR < 8.3.0 Reflected XSS via templateHtml Parameter in Patient Portal

Quick assessment

Affected
openemr openemr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

openemr是OpenEMR组织开源的一个支持文档管理与企业应用场景的医疗信息管理平台。 OpenEMR 8.3.0之前版本存在跨站脚本漏洞，该漏洞源于患者门户模板导入处理程序中的templateHtml GET参数未经过滤反射到页面响应，容易受到反射型跨站脚本攻击，可能导致会话劫持。

CVSS 6.1 · Medium EPSS 0.24% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
openemr openemr < 8.3.0 affected
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I. Basic Information for CVE-2026-40507

Vulnerability Information
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Vulnerability Title
OpenEMR < 8.3.0 Reflected XSS via templateHtml Parameter in Patient Portal
Source: CVE Program / CVE List V5
Vulnerability Description
OpenEMR before 8.3.0 contains a reflected cross-site scripting vulnerability in the patient portal template import handler. The templateHtml GET parameter is reflected into the page response without sanitization. An attacker can craft a URL that executes arbitrary JavaScript in the browser of any authenticated user with Forms Administration permissions who visits the link, enabling session hijacking.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
Vulnerability Title
OpenEMR 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
openemr是OpenEMR组织开源的一个支持文档管理与企业应用场景的医疗信息管理平台。 OpenEMR 8.3.0之前版本存在跨站脚本漏洞，该漏洞源于患者门户模板导入处理程序中的templateHtml GET参数未经过滤反射到页面响应，容易受到反射型跨站脚本攻击，可能导致会话劫持。
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

Vendor Product Affected Versions CPE Subscribe
openemr openemr 0 ~ 8.3.0 -

II. Public POCs for CVE-2026-40507

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III. Intelligence Information for CVE-2026-40507

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Patches & Fixes for CVE-2026-40507 (1)

Vendor Advisories for CVE-2026-40507 (2)

Vendor Pages for CVE-2026-40507 (1)

Same Patch Batch · openemr · 2026-08-19 · 4 CVEs total

CVE-2026-40508 5.4 MEDIUM OpenEMR < 8.3.0 Stored XSS via Patient Portal Template Import Handler
CVE-2026-40509 4.3 MEDIUM OpenEMR < 8.3.0 CSRF via DICOM Viewer web_path Parameter
CVE-2026-76614 4.3 MEDIUM OpenEMR < 8.3.0 Path Traversal Information Disclosure via EDI Archive Restore

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-40507

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