How severe is CVE-2020-36889?

CVE-2020-36889 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-36889 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36889?

CVE-2020-36889 affects Kentico Xperience. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-36889?

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

Does CVE-2020-36889 have an EU (EUVD) identifier?

Yes. CVE-2020-36889 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204379.

When was CVE-2020-36889 published?

CVE-2020-36889 was published on 2025-12-18 and last updated on 2026-06-17.

CVE-2020-36889

CVE-2020-36889 is a medium-severity vulnerability in Kentico Xperience with a CVSS 3.x base score of 5.4. 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 5.4)
CVSS v4: 5.1
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-204379
Weakness: CWE-79
Affected product: Kentico Xperience
Published: 2025-12-18
Last modified: 2026-06-17

Description

A stored cross-site scripting vulnerability in Kentico Xperience allows attackers to inject malicious scripts via error messages containing specially crafted object names. This allows malicious scripts to execute in users' browsers when administrators view error messages in the administration interface.

Frequently asked questions

What is CVE-2020-36889?: A stored cross-site scripting vulnerability in Kentico Xperience allows attackers to inject malicious scripts via error messages containing specially crafted object names. This allows malicious scripts to execute in users' browsers when administrators view error messages in the administration interface.
How severe is CVE-2020-36889?: CVE-2020-36889 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-36889 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36889?: CVE-2020-36889 affects Kentico Xperience. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-36889?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2020-36889 have an EU (EUVD) identifier?: Yes. CVE-2020-36889 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204379.
When was CVE-2020-36889 published?: CVE-2020-36889 was published on 2025-12-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kentico:xperience:*:*:*:*:*:*:*:*

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