openemr
Before 8.4.0 contains OAuth scope canonicalization and containment flaws that allow unauthenticated attackers to obtain unapproved system-level FHIR…
Not on CISA's list of exploited flaws, and not in the news we track.
CVE-2026-126473Critical9.3
Reading the vendor advisory
Black Shard's team can check your exposure to CVE-2026-126473 and take the fix off your plate.
OpenEMR before 8.4.0 contains OAuth scope canonicalization and containment flaws that allow unauthenticated attackers to obtain unapproved system-level FHIR access. Attackers can register a colon-form system:Patient.read client that bypasses approval, then request unregistered system/Patient.write scope to read, modify, and create Patient records.
Black Shard's team can check your exposure, take a fix off your plate or step in on a live incident.
Severity
9.3of 10, critical
Updated 13 Nov 2026, 12:04 UTC, 31 of 36 sources answering.
CISA Known Exploited Vulnerabilities, NVD, CVE.org, CIRCL Vulnerability-Lookup, GitHub Advisory Database (CC BY 4.0), OSV (CC BY 4.0), RansomLook (CC BY 4.0, enriched by Black Shard), SEC EDGAR, HHS breach portal, Have I Been Pwned (CC BY 4.0), Texas Attorney General, California Attorney General, Delaware Department of Justice, Vermont Attorney General, GDELT Project, Cloudflare status, abuse.ch SSLBL (CC0), CISA ICS advisories, NCSC UK (OGL v3.0), CERT-EU (CC BY 4.0), NCSC New Zealand (CC BY 4.0), MISP galaxy (CC0), OAIC determinations (CC BY 4.0), abuse.ch Feodo Tracker (CC0), Spamhaus DROP (Spamhaus DROP terms), blocklist.de, CINS Army, CERT-FR (Licence Ouverte 2.0), Red Hat Security Data (CC BY 4.0), ENISA EUVD, Microsoft MSRC, JVN iPedia, FIRST EPSS, IODA, GeoNames (CC BY 4.0), Natural Earth, Wikidata, Regional Internet Registries (delegation statistics), Protomaps, OpenStreetMap contributors (ODbL), NASA GIBS. Items link to their sources, except leak-site claims, which are never linked. This product uses the NVD API but is not endorsed or certified by the NVD.
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