Answer in brief
CVE-2026-40507 records a Medium severity (CVSS 5.1) vulnerability in OpenEMR < 8.3.0 Reflected XSS via templateHtml Parameter in Patient Portal. The current sources do not mark it as known exploited. The current feed maps openemr/openemr (generic), openemr/openemr (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps openemr/openemr (generic), openemr/openemr (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| openemr/openemrgeneric | * | Not reported |
| openemr/openemrgeneric | >=0 <8.3.0 | 8.3.0 |
Published upstream
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 19, 2026
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.
Quoted source text, attributed separately from HOL analysis.