What is CVE-2023-48838?

CVE-2023-48838 is a medium-severity vulnerability in Phpjabbers Appointment Scheduler, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-12-07.

How severe is CVE-2023-48838?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Phpjabbers Appointment Scheduler

CVE-2023-48838

Appointment Scheduler 3.0 is vulnerable to Multiple HTML Injection issues via the SMS API Key or Default Country Code.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-12-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (37.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Phpjabbers Appointment Scheduler — versions 3.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.phpjabbers.com/appointment-scheduler/ (Product)
packetstormsecurity.com/files/176054 (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2023-48838?: CVE-2023-48838 is a medium-severity vulnerability in Phpjabbers Appointment Scheduler, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-12-07.
How severe is CVE-2023-48838?: Medium severity. CVSS v3 base score is 5.4 out of 10.