How severe is CVE-2020-35416?

CVE-2020-35416 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-35416 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35416?

CVE-2020-35416 affects Onlineonly Phpjabbers Appointment Scheduler. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35416?

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

When was CVE-2020-35416 published?

CVE-2020-35416 was published on 2020-12-15 and last updated on 2026-06-17.

CVE-2020-35416

CVE-2020-35416 is a medium-severity vulnerability in Onlineonly Phpjabbers Appointment Scheduler with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Onlineonly Phpjabbers Appointment Scheduler
Published: 2020-12-15
Last modified: 2026-06-17

Description

Multiple cross-site scripting (XSS) vulnerabilities exist in PHPJabbers Appointment Scheduler 2.3, in the index.php admin login webpage (with different request parameters), allows remote attackers to inject arbitrary web script or HTML.

Frequently asked questions

What is CVE-2020-35416?: Multiple cross-site scripting (XSS) vulnerabilities exist in PHPJabbers Appointment Scheduler 2.3, in the index.php admin login webpage (with different request parameters), allows remote attackers to inject arbitrary web script or HTML.
How severe is CVE-2020-35416?: CVE-2020-35416 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-35416 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35416?: CVE-2020-35416 affects Onlineonly Phpjabbers Appointment Scheduler. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35416?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-35416 published?: CVE-2020-35416 was published on 2020-12-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:onlineonly:phpjabbers_appointment_scheduler:2.3:*:*:*:*:*:*:*

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