How severe is CVE-2025-48953?

CVE-2025-48953 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-48953 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-48953?

CVE-2025-48953 affects Umbraco Umbraco Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-48953?

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

Does CVE-2025-48953 have an EU (EUVD) identifier?

Yes. CVE-2025-48953 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16778.

When was CVE-2025-48953 published?

CVE-2025-48953 was published on 2025-06-03 and last updated on 2026-06-17.

CVE-2025-48953

CVE-2025-48953 is a medium-severity vulnerability in Umbraco Umbraco Cms with a CVSS 3.x base score of 5.5. 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-434.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16778
Weakness: CWE-434
Affected product: Umbraco Umbraco Cms
Published: 2025-06-03
Last modified: 2026-06-17

Description

Umbraco is an ASP.NET content management system (CMS). Starting in version 14.0.0 and prior to versions 15.4.2 and 16.0.0, it's possible to upload a file that doesn't adhere with the configured allowable file extensions via a manipulated API request. The issue is patched in versions 15.4.2 and 16.0.0. No known workarounds are available.

Frequently asked questions

What is CVE-2025-48953?: Umbraco is an ASP.NET content management system (CMS). Starting in version 14.0.0 and prior to versions 15.4.2 and 16.0.0, it's possible to upload a file that doesn't adhere with the configured allowable file extensions via a manipulated API request. The issue is patched in versions 15.4.2 and 16.0.0. No known workarounds are available.
How severe is CVE-2025-48953?: CVE-2025-48953 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-48953 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-48953?: CVE-2025-48953 affects Umbraco Umbraco Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-48953?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-48953 have an EU (EUVD) identifier?: Yes. CVE-2025-48953 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16778.
When was CVE-2025-48953 published?: CVE-2025-48953 was published on 2025-06-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*

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