CVE-2026-19416 KiviCare < 4.5.4 - Patient+ Cross-Patient Appointment Modification via IDOR
Authenticated patients can modify other patients' appointments due to missing ownership verification in the KiviCare plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-19416?
CVE-2026-19416 is a medium-severity missing authorization vulnerability in Unknown KiviCare, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The KiviCare WordPress plugin before 4.5.4 does not verify that the requesting user owns the appointment being modified, allowing authenticated patient-level users to cancel and reschedule other patients' appointments.
Weakness: CWE-639
Which versions are affected by CVE-2026-19416?
How do I fix CVE-2026-19416?
No fix has been published for CVE-2026-19416 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-19416 being exploited?
There is no known exploitation of CVE-2026-19416 in the wild and no public exploit code.
Sources
Also known as GHSA-q77f-2653-fm5r.