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CVE-2026-40508— OpenEMR < 8.3.0 Stored XSS via Patient Portal Template Import Handler

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未对上传的模板文件进行清理，可能导致存储型跨站脚本攻击，具有Forms Administration权限的已认证攻击者可上传包含任意HTML或JavaScript的模板文件，当其他表单管理用户在HTML编辑器中查看模板时，恶意脚本会在其浏览器中执行。

CVSS 5.4 · Medium EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
openemr openemr < 8.3.0 affected
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I. Basic Information for CVE-2026-40508

Vulnerability Information
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Vulnerability Title
OpenEMR < 8.3.0 Stored XSS via Patient Portal Template Import Handler
Source: CVE Program / CVE List V5
Vulnerability Description
OpenEMR before 8.3.0 contains a stored cross-site scripting vulnerability in the patient portal template import handler that allows authenticated attackers with Forms Administration permissions to upload template files containing arbitrary HTML or JavaScript. Attackers can inject malicious scripts through the template upload functionality, which are stored without sanitization and execute in the browser of any other Forms Administration user who views the template in the HTML editor.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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未对上传的模板文件进行清理，可能导致存储型跨站脚本攻击，具有Forms Administration权限的已认证攻击者可上传包含任意HTML或JavaScript的模板文件，当其他表单管理用户在HTML编辑器中查看模板时，恶意脚本会在其浏览器中执行。
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-2026-40508

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III. Intelligence Information for CVE-2026-40508

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Patches & Fixes for CVE-2026-40508 (1)

Vendor Advisories for CVE-2026-40508 (2)

Vendor Pages for CVE-2026-40508 (1)

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

CVE-2026-40507 6.1 MEDIUM OpenEMR < 8.3.0 Reflected XSS via templateHtml Parameter in Patient Portal
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-2026-40508

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