How severe is CVE-2020-15803?

CVE-2020-15803 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-2020-15803 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 32% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15803?

CVE-2020-15803 primarily affects Zabbix. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-15803?

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

When was CVE-2020-15803 published?

CVE-2020-15803 was published on 2020-07-17 and last updated on 2026-06-17.

CVE-2020-15803

CVE-2020-15803 is a medium-severity vulnerability in Zabbix with a CVSS 3.x base score of 6.1. Its EPSS exploit-prediction score of 32% places it in the 98th percentile, indicating an elevated likelihood of exploitation. 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: 32% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Zabbix
Published: 2020-07-17
Last modified: 2026-06-17

Description

Zabbix before 3.0.32rc1, 4.x before 4.0.22rc1, 4.1.x through 4.4.x before 4.4.10rc1, and 5.x before 5.0.2rc1 allows stored XSS in the URL Widget.

Frequently asked questions

What is CVE-2020-15803?: Zabbix before 3.0.32rc1, 4.x before 4.0.22rc1, 4.1.x through 4.4.x before 4.4.10rc1, and 5.x before 5.0.2rc1 allows stored XSS in the URL Widget.
How severe is CVE-2020-15803?: CVE-2020-15803 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-2020-15803 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 32% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15803?: CVE-2020-15803 primarily affects Zabbix. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-15803?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-15803 published?: CVE-2020-15803 was published on 2020-07-17 and last updated on 2026-06-17.

References

Affected products (15)

cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:3.0.32:rc1:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:4.0.22:-:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:4.0.22:rc1:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:4.4.10:-:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:4.4.10:rc1:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:5.0.2:-:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:5.0.2:rc1:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:backports:sle-15:sp1:*:*:*:*:*:*
cpe:2.3:o:opensuse:backports:sle-15:sp2:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*

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