CVE-2021-39221 XSS in Contacts

2021-10-2519:05:10

CWE-434

CWE-79

GitHub_M

www.cve.org

nextcloud

contacts

xss

vulnerability

content-security-policy

upgrade

CVSS3

6.4

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

EPSS

0.001

Percentile

19.4%

JSON

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Contacts application prior to version 4.0.3 was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Contacts application is upgraded to 4.0.3. As a workaround, one may use a browser that has support for Content-Security-Policy.

CNA Affected

[
  {
    "product": "security-advisories",
    "vendor": "nextcloud",
    "versions": [
      {
        "status": "affected",
        "version": "< 4.0.3"
      }
    ]
  }
]