Critical· 9.6official fix available
CVE-2026-39620
A critical CSRF vulnerability in the Appointment app allows attackers to upload a web shell to a web server. It affects versions up to and including 3.5.5.
publishedApr 8, 2026
last modifiedJul 24, 2026
sourcesNVD
severity · cvss
9.6
critical · how bad it is
exploitation · epss
<1%
4th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 25, 2026
An official fix is available, so this entry is kept for 30 days and then removed automatically.
01
Who is affected
Users of Appointment versions <= 3.5.5
02
Real-world impact
Attackers could execute arbitrary code on the server via crafted requests.
03
Why this severity
CVSS 9.6 (critical): High risk of server compromise through user interaction.
04
What to do about it
official fix available
recommended steps
- 01Check the current Appointment version. If it is 3.5.5 or earlier, upgrade to version 3.5.6 or later.
- 02Apply the vendor-provided patch or update mechanism for Appointment.
- 03Restart the Appointment service after updating to ensure changes take effect.
NVD reference to affected versions (3.5.5 and earlier)
05
Timeline
- Apr 8, 2026 · Apr 8, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 24, 2026 · 11d agoAdvisory updatedThe NVD record was last revised.
- Jul 26, 2026 · 10d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
06
How it’s attacked
Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07
References & advisories
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →