How severe is CVE-2025-66551?

CVE-2025-66551 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity high, and availability low.

Is CVE-2025-66551 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66551?

CVE-2025-66551 affects Nextcloud Tables. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66551?

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

Does CVE-2025-66551 have an EU (EUVD) identifier?

Yes. CVE-2025-66551 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201440.

When was CVE-2025-66551 published?

CVE-2025-66551 was published on 2025-12-05 and last updated on 2026-06-17.

CVE-2025-66551

CVE-2025-66551 is a medium-severity vulnerability in Nextcloud Tables with a CVSS 3.x base score of 6.3. 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-639.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201440
Weakness: CWE-639
Affected product: Nextcloud Tables
Published: 2025-12-05
Last modified: 2026-06-17

Description

Nextcloud Tables allows you to create your own tables with individual columns. Prior to 0.8.6 and 0.9.3, a malicious user was able to create their own table and then move a column to a victims table. This vulnerability is fixed in 0.8.6 and 0.9.3.

Frequently asked questions

What is CVE-2025-66551?: Nextcloud Tables allows you to create your own tables with individual columns. Prior to 0.8.6 and 0.9.3, a malicious user was able to create their own table and then move a column to a victims table. This vulnerability is fixed in 0.8.6 and 0.9.3.
How severe is CVE-2025-66551?: CVE-2025-66551 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity high, and availability low.
Is CVE-2025-66551 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66551?: CVE-2025-66551 affects Nextcloud Tables. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66551?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66551 have an EU (EUVD) identifier?: Yes. CVE-2025-66551 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201440.
When was CVE-2025-66551 published?: CVE-2025-66551 was published on 2025-12-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:tables:*:*:*:*:*:nextcloud:*:*

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