CVE-2023-48839: Appointment Scheduler 3.0 is vulnerable to Multiple Stored Cross-Site Scripting (XSS) issues via the name, plu

Routine

MEDIUM 5.4DOWNGRADE

CVE-2023-48839 is a medium-severity flaw (CVSS 5.4) affecting appointment scheduler. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Appointment Scheduler 3.0 is vulnerable to Multiple Stored Cross-Site Scripting (XSS) issues via the name, plugin_sms_api_key, plugin_sms_country_code, calendar_id, title, country name, or customer_name parameter.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-12-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: phpjabbers

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-12-07 07:15 UTCPublished CVE record published
2026-06-17 06:35 UTCUpdated Record last modified

phpjabbers appointment scheduler DOWNGRADE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

1. Check installed version

apt-cache policy appointment-scheduler || rpm -q appointment-scheduler || appointment-scheduler --version

2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)

apt-cache madison appointment-scheduler sudo apt install appointment-scheduler=<VERSION_BEFORE_3.0> sudo apt-mark hold appointment-scheduler

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list appointment-scheduler sudo dnf downgrade appointment-scheduler-<VERSION_BEFORE_3.0> sudo dnf versionlock add appointment-scheduler

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-48839?

appointment scheduler: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-48839 being exploited?

CVE-2023-48839 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-48839 affect?

CVE-2023-48839 affects appointment scheduler. Severity is medium (CVSS 5.4). Appointment Scheduler 3.0 is vulnerable to Multiple Stored Cross-Site Scripting (XSS) issues via the name, plugin_sms_api_key, plugin_sms_country_code, calendar_id, title, country name, or customer_name parameter.

How urgent is CVE-2023-48839?

Priority 28/100. No elevated risk signals yet.

Related CVEs

CVE-2023-48841 HIGH 8.8 DOWNGRADE Appointment Scheduler 3.0 is vulnerable to CSV Injection via a Language > Labels > Export action.
CVE-2023-48840 HIGH 7.5 DOWNGRADE A lack of rate limiting in pjActionAjaxSend in Appointment Scheduler 3.0 allows attackers to cause resource ex
CVE-2023-48838 MEDIUM 5.4 DOWNGRADE Appointment Scheduler 3.0 is vulnerable to Multiple HTML Injection issues via the SMS API Key or Default Count
CVE-2023-36127 HIGH 7.5 DOWNGRADE User enumeration is found in in PHPJabbers Appointment Scheduler 3.0
CVE-2023-36126 MEDIUM 6.1 DOWNGRADE There is a Cross Site Scripting (XSS) vulnerability in the "theme" parameter of preview.php in PHPJabbers Appo

References

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