How severe is CVE-2025-66515?

CVE-2025-66515 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-66515 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66515?

CVE-2025-66515 affects Nextcloud Approval. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66515?

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

Does CVE-2025-66515 have an EU (EUVD) identifier?

Yes. CVE-2025-66515 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201457.

When was CVE-2025-66515 published?

CVE-2025-66515 was published on 2025-12-05 and last updated on 2026-06-17.

CVE-2025-66515

CVE-2025-66515 is a low-severity vulnerability in Nextcloud Approval with a CVSS 3.x base score of 2.7. 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-287.

Key facts

Severity: Low (CVSS 3.x base score 2.7)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201457
Weakness: CWE-287
Affected product: Nextcloud Approval
Published: 2025-12-05
Last modified: 2026-06-17

Description

The Nextcloud Approval app allows approval or disapproval of files in the sidebar. Prior to 1.3.1 and 2.5.0, an authenticated user listed as a requester in a workflow can set another user’s file into the “pending approval” without access to the file by using the numeric file id. This vulnerability is fixed in 1.3.1 and 2.5.0.

Frequently asked questions

What is CVE-2025-66515?: The Nextcloud Approval app allows approval or disapproval of files in the sidebar. Prior to 1.3.1 and 2.5.0, an authenticated user listed as a requester in a workflow can set another user’s file into the “pending approval” without access to the file by using the numeric file id. This vulnerability is fixed in 1.3.1 and 2.5.0.
How severe is CVE-2025-66515?: CVE-2025-66515 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-66515 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66515?: CVE-2025-66515 affects Nextcloud Approval. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66515?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66515 have an EU (EUVD) identifier?: Yes. CVE-2025-66515 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201457.
When was CVE-2025-66515 published?: CVE-2025-66515 was published on 2025-12-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:approval:*:*:*:*:*:nextcloud:*:*

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