How severe is CVE-2025-66103?

CVE-2025-66103 has a CVSS 3.x base score of 6.5, 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 low.

Is CVE-2025-66103 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.

How do I fix CVE-2025-66103?

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

Does CVE-2025-66103 have an EU (EUVD) identifier?

Yes. CVE-2025-66103 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205806.

When was CVE-2025-66103 published?

CVE-2025-66103 was published on 2025-12-30 and last updated on 2026-06-17.

CVE-2025-66103

CVE-2025-66103 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. 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 6.5)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205806
Weakness: CWE-79
Published: 2025-12-30
Last modified: 2026-06-17

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in revmakx WPCal.io wpcal allows DOM-Based XSS.This issue affects WPCal.io: from n/a through <= 0.9.5.9.

Frequently asked questions

What is CVE-2025-66103?: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in revmakx WPCal.io wpcal allows DOM-Based XSS.This issue affects WPCal.io: from n/a through <= 0.9.5.9.
How severe is CVE-2025-66103?: CVE-2025-66103 has a CVSS 3.x base score of 6.5, 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 low.
Is CVE-2025-66103 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.
How do I fix CVE-2025-66103?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66103 have an EU (EUVD) identifier?: Yes. CVE-2025-66103 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205806.
When was CVE-2025-66103 published?: CVE-2025-66103 was published on 2025-12-30 and last updated on 2026-06-17.

References

https://patchstack.com/database/Wordpress/Plugin/wpcal/vulnerability/wordpress-wpcal-io-plugin-0-9-5-9-cross-site-scripting-xss-vulnerability?_s_id=cve

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