How severe is CVE-2025-55420?

CVE-2025-55420 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-55420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-55420?

CVE-2025-55420 affects Foxcms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-55420?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-55420 have an EU (EUVD) identifier?

Yes. CVE-2025-55420 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25450.

When was CVE-2025-55420 published?

CVE-2025-55420 was published on 2025-08-21 and last updated on 2026-06-17.

CVE-2025-55420

CVE-2025-55420 is a high-severity vulnerability in Foxcms with a CVSS 3.x base score of 8.8. 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: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25450
Weakness: CWE-79
Affected product: Foxcms
Published: 2025-08-21
Last modified: 2026-06-17

Description

A Reflected Cross Site Scripting (XSS) vulnerability was found in /index.php in FoxCMS v1.2.6. When a crafted script is sent via a GET request, it is reflected unsanitized into the HTML response. This permits execution of arbitrary JavaScript code when a logged-in user submits the malicious input.

Frequently asked questions

What is CVE-2025-55420?: A Reflected Cross Site Scripting (XSS) vulnerability was found in /index.php in FoxCMS v1.2.6. When a crafted script is sent via a GET request, it is reflected unsanitized into the HTML response. This permits execution of arbitrary JavaScript code when a logged-in user submits the malicious input.
How severe is CVE-2025-55420?: CVE-2025-55420 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-55420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-55420?: CVE-2025-55420 affects Foxcms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-55420?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-55420 have an EU (EUVD) identifier?: Yes. CVE-2025-55420 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25450.
When was CVE-2025-55420 published?: CVE-2025-55420 was published on 2025-08-21 and last updated on 2026-06-17.

References

https://www.notion.so/FoxCMS-V1-2-6-Reflected-XSS-in-index-php-2222b2fd021080589d27ef8e1b9ebd86?source=copy_link

Affected products (1)

cpe:2.3:a:foxcms:foxcms:1.2.6:*:*:*:*:*:*:*

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