How severe is CVE-2026-33911?

CVE-2026-33911 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-33911 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33911?

CVE-2026-33911 affects Open-emr Openemr. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33911?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33911 have an EU (EUVD) identifier?

Yes. CVE-2026-33911 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16019.

When was CVE-2026-33911 published?

CVE-2026-33911 was published on 2026-03-25 and last updated on 2026-06-17.

CVE-2026-33911

CVE-2026-33911 is a medium-severity vulnerability in Open-emr Openemr with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16019
Weakness: CWE-79
Affected product: Open-emr Openemr
Published: 2026-03-25
Last modified: 2026-06-17

Description

OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 8.0.0.3, the POST parameter `title` is reflected back in a JSON response built with `json_encode()`. Because the response is served with a `text/html` Content-Type, the browser interprets injected HTML/script tags rather than treating the output as JSON. An authenticated attacker can craft a request that executes arbitrary JavaScript in a victim's session. Version 8.0.0.3 contains a fix.

Frequently asked questions

What is CVE-2026-33911?: OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 8.0.0.3, the POST parameter `title` is reflected back in a JSON response built with `json_encode()`. Because the response is served with a `text/html` Content-Type, the browser interprets injected HTML/script tags rather than treating the output as JSON. An authenticated attacker can craft a request that executes arbitrary JavaScript in a victim's session. Version 8.0.0.3 contains a fix.
How severe is CVE-2026-33911?: CVE-2026-33911 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-33911 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33911?: CVE-2026-33911 affects Open-emr Openemr. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33911?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33911 have an EU (EUVD) identifier?: Yes. CVE-2026-33911 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16019.
When was CVE-2026-33911 published?: CVE-2026-33911 was published on 2026-03-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:open-emr:openemr:*:*:*:*:*:*:*:*

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