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CVE-2026-126450 OpenEMR before 8.5.0 Stored XSS via Patient External ID in Prescriptions

5.3 mediumEPSS 0.3%

Medium (5.3) in openemr openemr. EPSS 0.3% estimated probability of exploitation activity in the next 30 days.

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OpenEMR before 8.5.0 contains a stored cross-site scripting vulnerability that allows authenticated users to inject scripts by placing payloads in the patient External ID field. The payload executes when other users open the patient's prescriptions via View Printable Version (HTML), running script in their browser sessions.

Severity

CVSS 4.0

5.3 medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

CVSS 3.1

5.0 medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
EPSS
0.3% estimated probability of exploitation activity in the next 30 days; 24th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CWE
CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page
OWASP Top 10
A05:2025 Injection
Published
Modified
Assigned by
VulnCheck (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
openemrbefore 8.5.0

Attack patterns (CAPEC)

  • CAPEC-18 XSS Targeting Non-Script Elements Likelihood: High · Severity: Very High
  • CAPEC-32 XSS Through HTTP Query Strings Likelihood: High · Severity: High
  • CAPEC-86 XSS Through HTTP Headers Likelihood: High · Severity: Very High
  • CAPEC-193 PHP Remote File Inclusion Likelihood: High · Severity: High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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