5.4

CVE-2025-66554: nextcloud contacts Cross-site Scripting

CVSS: 5.4v3.1MediumAnalyzed
Published 05-12-2025Last modified 08-12-2025
Open JSON

Vulnerability summary

CVE-2025-66554 is a medium (CVSS 5.4) Cross-site Scripting vulnerability in nextcloud contacts. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (NVD)
EPSS score
0.25%
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

Contacts app for Nextcloud easily syncs contacts from various devices with your Nextcloud and allows editing. Prior to 5.5.4, 6.0.6, and 7.2.5, a malicious user was able to modify their organisation and title field to load additional CSS files. Javascript and other options were correctly blocked by the content security policy of the Nextcloud Server code. This vulnerability is fixed in 5.5.4, 6.0.6, and 7.2.5.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

0.00 pp

From 0.25% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.25%

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
  • contacts≥ 5.0.0, < 5.5.4 | ≥ 6.0.0, < 6.0.6 | ≥ 7.0.0, < 7.2.5
  • security-advisories≥ 7.0.0-alpha.1, < 7.2.5 | ≥ 6.0.0-alpha1, < 6.0.6 | < 5.5.4

1 vendor · 2 products

References

4 links