How severe is CVE-2025-66548?

CVE-2025-66548 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-66548 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66548?

CVE-2025-66548 affects Nextcloud Deck. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66548?

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

Does CVE-2025-66548 have an EU (EUVD) identifier?

Yes. CVE-2025-66548 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201466.

When was CVE-2025-66548 published?

CVE-2025-66548 was published on 2025-12-05 and last updated on 2026-06-17.

CVE-2025-66548

CVE-2025-66548 is a low-severity vulnerability in Nextcloud Deck with a CVSS 3.x base score of 3.3. 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-116.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201466
Weakness: CWE-116
Affected product: Nextcloud Deck
Published: 2025-12-05
Last modified: 2026-06-17

Description

Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.

Frequently asked questions

What is CVE-2025-66548?: Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.
How severe is CVE-2025-66548?: CVE-2025-66548 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-66548 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66548?: CVE-2025-66548 affects Nextcloud Deck. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66548?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66548 have an EU (EUVD) identifier?: Yes. CVE-2025-66548 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201466.
When was CVE-2025-66548 published?: CVE-2025-66548 was published on 2025-12-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*

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