4.3

CVE-2025-66547: nextcloud nextcloud_server

CVSS: 4.3v3.1MediumAnalyzed
AliasesCGA-24jv-7p2h-jw57CGA-fmhj-p2rf-wpw4
Published 05-12-2025Last modified 05-12-2025
Open JSON

Vulnerability summary

CVE-2025-66547 is a medium (CVSS 4.3) vulnerability in nextcloud nextcloud_server. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 19.1% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.28%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-RCQW-JMP9-XQ83

Timeline

  1. 05-12-2025
    PublishedVulnerability first disclosed.
  2. 05-12-2025
    Last modifiedVulnerability information updated.

Description

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

0.00 pp

From 0.28% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.28%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Nextcloud2 products
Chainguard1 product
  • nextcloud-server-30All versions (No fix recorded)

2 vendors · 3 products

References

7 links