Vulnerability Monitor

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CVE-2025-66554

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.

Published

2025-12-05T18:15:58.630

Last Modified

2025-12-09T17:01:51.250

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 3.5 (LOW)

Weaknesses

Type: Secondary
CWE-79

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	nextcloud	contacts	< 5.5.4	Yes
Application	nextcloud	contacts	< 6.0.6	Yes
Application	nextcloud	contacts	< 7.2.5	Yes

References

https://github.com/nextcloud/contacts/commit/d954d098978dde1f121600e8b994e02f293c68b1 Patch ([email protected])
https://github.com/nextcloud/contacts/pull/4619 Issue Tracking, Patch ([email protected])
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-9v78-cpfc-v6h2 Patch, Vendor Advisory ([email protected])
https://hackerone.com/reports/3293290 Permissions Required, Vendor Advisory ([email protected])