CVE-2021-39221 describes a stored Cross-Site Scripting (XSS) vulnerability in the Nextcloud Contacts application prior to version 4.0.3. An authenticated user could exploit this by right-clicking and opening a malicious file in a new tab. The vulnerability has a CVSS score of 5.4 (Medium), indicating a network-based attack requiring low privileges and user interaction, with potential for low confidentiality and integrity impact. Despite the vulnerability, Nextcloud's strict Content-Security-Policy significantly mitigates exploitation on modern browsers. There is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 4.0.3CPE matchmatch criteria | cpe:2.3:a:nextcloud:contacts:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.