4.3

CVE-2025-66545: nextcloud group_folders Improper Neutralization

CVSS: 4.3v3.1MediumAnalyzed
Published 05-12-2025Last modified 08-12-2025
Open JSON

Vulnerability summary

CVE-2025-66545 is a medium (CVSS 4.3) Improper Neutralization vulnerability in nextcloud group_folders. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 19.5% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (NVD)
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

Timeline

  1. 05-12-2025
    PublishedVulnerability first disclosed.
  2. 08-12-2025
    Last modifiedVulnerability information updated.

Description

Nextcloud Groupfolders provides admin-configured folders shared by everyone in a group or team. Prior to 14.0.11, 15.3.12, 16.0.15, 17.0.14, 18.1.8, 19.1.8, and 20.1.2, a user with read-only permission can restore a file from the trash bin. This vulnerability is fixed in 14.0.11, 15.3.12, 16.0.15, 17.0.14, 18.1.8, 19.1.8, and 20.1.2.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

0.00 pp

From 0.28% on 20-09-2026

20-09-202620-10-2026
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
  • group_folders< 14.0.11 | ≥ 15.0.0, < 15.3.12 | ≥ 16.0.0, < 16.0.15 | ≥ 17.0.0, < 17.0.14 | ≥ 18.0.0, < 18.1.8 | ≥ 19.0.0, < 20.1.2
  • security-advisories< 14.0.11 | ≥ 15.0.0-beta1, < 15.3.12 | ≥ 16.0.0, < 16.0.15 | ≥ 17.0.0-beta.1, < 17.0.14 | ≥ 18.0.0-beta.1, < 18.1.8 | ≥ 19.0.0-alpha.1, < 19.1.8 | ≥ 20.0.0, < 20.1.2

1 vendor · 2 products

References

4 links