CVE-2021-25921 — CVE-2021-25921 | In OpenEMR, versions 2.7.3-rc1 to 6.0.0 are vulnerable to Stored Cross-S… — CVE & Security Advisory Radar

🎯 CVE-2021-25921 🧪 PoC 🇪🇺 EUVD

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CVE-2021-25921 | In OpenEMR, versions 2.7.3-rc1 to 6.0.0 are vulnerable to Stored Cross-Site-Scripting (XSS) due to user input not being validated properly in the `Allergies` section. An attacker could lure an admin to enter a malicious payload and by that initiate the exploit.

In OpenEMR, versions 2.7.3-rc1 to 6.0.0 are vulnerable to Stored Cross-Site-Scripting (XSS) due to user input not being validated properly in the `Allergies` section. An attacker could lure an admin to enter a malicious payload and by that initiate the exploit.

Klassifikation & Betroffenheit:

n/a OpenEMR 2.7.3-rc1, 2.8.0, 2.8.1, 2.8.2, 2.8.3, 2.9.0, 3.0.0, 3.0.1, 3.1.0, 3.2.0, 4.0.0, 4.1.0, 4.1.1, 4.1.2, 4.1.2.3, 4.1.2.6, 4.1.2.7, 4.2.0, 4.2.0.3, 4.2.1, 4.2.2, 5.0.0, 5.0.0.5, 5.0.0.6, 5.0.1, 5.0.1.1, 5.0.1.2, 5.0.1.3, 5.0.1.4, 5.0.1.5, 5.0.1.6, 5.0.1.7, 5.0.2, 5.0.2.1, 5.0.2.2, 5.0.2.3, 5.0.2.4, 6.0.0OpenEMR 2.7.3-rc1, 2.8.0, 2.8.1, 2.8.2, 2.8.3, 2.9.0, 3.0.0, 3.0.1, 3.1.0, 3.2.0, 4.0.0, 4.1.0, 4.1.1, 4.1.2, 4.1.2.3, 4.1.2.6, 4.1.2.7, 4.2.0, 4.2.0.3, 4.2.1, 4.2.2, 5.0.0, 5.0.0.5, 5.0.0.6, 5.0.1, 5.0.1.1, 5.0.1.2, 5.0.1.3, 5.0.1.4, 5.0.1.5, 5.0.1.6, 5.0.1.7, 5.0.2, 5.0.2.1, 5.0.2.2, 5.0.2.3, 5.0.2.4, 6.0.0open-emr openemr *

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') 🎯 High

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

🛡️ Empfohlene Mitigation: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482]. Examples of libraries and frameworks that make it easier to generate properly encoded output include Microsoft's Anti-XSS library, the OWASP ESAPI Encoding module, and …

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-63 · Cross-Site Scripting (XSS) (Very High) CAPEC-85 · AJAX Footprinting (Low) CAPEC-209 · XSS Using MIME Type Mismatch (Medium) CAPEC-588 · DOM-Based XSS (Very High) CAPEC-591 · Reflected XSS (Very High) CAPEC-592 · Stored XSS (Very High)

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2026-107166 6.9 CVE-2026-105707 6.9 CVE-2026-105571 6.9 CVE-2026-105307 6.9 CVE-2026-105149 6.9

🩹 Patch verfügbar (OSV):

🩹 0fadc3e592d84bc9dfe9e0403f8bd6e3c7d8427f (Commit)

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2021

Veröffentlicht 03/2021

Heute 10.10.

CVSS-Vektor-Analyse: 5.4

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Gering

UI · Interaktion Erforderlich

S · Scope Verändert

C · Vertraulichkeit Gering

I · Integrität Gering

A · Verfügbarkeit Keine

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Veröffentlicht:22.03.2021

Aktualisiert:17.06.2026 03:42

Assigner (CNA):Mend

EUVD-ID:EUVD-2021-12787

EPSS-Verlauf (9 Messungen)

Quellen: 🇪🇺 EUVD-Datenbank (ENISA) + 🇺🇸 NVD-Anreicherung · 24-h-Cache

CWE-79: Cross-Site Scripting ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

Tier	CVEs	Anteil
≥90 %	720	0,2 %
≥50 %	3.223	0,9 %
≥10 %	22.115	6,0 %
<10 %	342.354	92,9 %

5.4 MEDIUM

EPSS

91.1%

CVE-2021-25921 🌐 Netzwerk (Remote) 🔑 Geringe Nutzerrechte nötig

n/a

CVE-2021-25921 | In OpenEMR, versions 2.7.3-rc1 to 6.0.0 are vulnerable to Stored Cross-Site-Scripting (XSS) due to user input not being validated properly in the `Allergies` section. An attacker could lure an admin to enter a malicious payload and by that initiate the exploit.

CWE-79: Cross-Site Scripting ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

22.03.2021

🛡️ Details ➔

CVE-2021-25921 | In OpenEMR, versions 2.7.3-rc1 to 6.0.0 are vulnerable to Stored Cross-Site-Scripting (XSS) due to user input not being validated properly in the `Allergies` section. An attacker could lure an admin to enter a malicious payload and by that initiate the exploit.

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CVE-2021-25921 | In OpenEMR, versions 2.7.3-rc1 to 6.0.0 are vulnerable to Stored Cross-Site-Scripting (XSS) due to user input not being validated properly in the `Allergies` section. An attacker could lure an admin to enter a malicious payload and by that initiate the exploit.