Is CVE-2025-66557 in the CISA KEV catalog?

No. CVE-2025-66557 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-66557?

CVE-2025-66557 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2025-66557?

CVE-2025-66557 has an EPSS score of 0.24% (15th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66557?

Upgrade deck to 1.15.2 or later.

CVE & CISA-KEV Catalog

CVE-2025-66557

MEDIUM

5.4

CVSS v3

NVD

Description

Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.14.6 and 1.15.2, a bug in the permission logic allowed users with "Can share" permission to modify the permissions of other recipients. This vulnerability is fixed in 1.14.6 and 1.15.2.

CWE-284Improper Access Control

How to fix

Remediation Available

deckNVD

Affected:>= 1.15.0, < 1.15.2Fixed in:1.15.2CVE-2025-66557derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Exploit Intelligence

0.24%probability of exploitation in 30 days

15thpercentile

Low risk: more likely to be exploited than 15% of all known CVEs.

References

Patch3

Vendor Advisory1

hackerone.com

Related Vulnerabilities

Other CWE-284 (Improper Access Control) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-27350	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-1653	High	7.5	100%	KEV	-
CVE-2023-23752	Medium	5.3	100%	KEV	Fix
CVE-2023-29298	High	7.5	100%	KEV	-
CVE-2023-38205	High	7.5	100%	KEV	-
CVE-2024-27348	Critical	9.8	99%	KEV	Fix

Embed a live status badge for CVE-2025-66557

Markdown

[![CVE-2025-66557](https://tridentstack.com/cve/badge/CVE-2025-66557.svg)](https://tridentstack.com/cve/CVE-2025-66557)

HTML

<a href="https://tridentstack.com/cve/CVE-2025-66557"><img src="https://tridentstack.com/cve/badge/CVE-2025-66557.svg" alt="CVE-2025-66557"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-09.