Vulnerability record
CVE-2026-126451
The short answer
CVE-2026-126451 affects openemr openemr and is rated high (CVSS 8.5). It is not in CISA's KEV catalog; EPSS puts the chance of exploitation in the next 30 days at 0.37%.
What it is
OpenEMR before 8.5.0 contains a stored cross-site scripting vulnerability that allows portal patients to run JavaScript in staff sessions by injecting javascript: URLs into document template_data. Attackers can submit an encounterForm value rendered unsanitized into an iframe src by DocumentTemplateRender, letting the script read PHI and CSRF tokens and call staff or admin endpoints.
Weakness: CWE-79.
Severity
8.5 high
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Exploited (CISA KEV)
Not listed
CISA lists confirmed exploitation only
EPSS, next 30 days
0.37%
Higher than 31% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- Low
- User interaction
- Passive
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- None
Affected products
openemr. NVD's record lists the exact affected versions.
References
Questions
Is CVE-2026-126451 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-14. FIRST's EPSS estimates a 0.37% chance of exploitation in the next 30 days.
How do I fix CVE-2026-126451?
Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Undergoing Analysis. The description is NVD's text, quoted as published.
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