CVE-2021-39222 XSS in Talk

2021-11-1518:30:13

CWE-434

CWE-79

GitHub_M

www.cve.org

6.4 Medium

CVSS3

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

0.001 Low

EPSS

Percentile

31.8%

JSON

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Talk application 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 Talk application is upgraded to patched versions 10.0.7, 10.1.4, 11.1.2, 11.2.0 or 12.0.0. As a workaround, use a browser that has support for Content-Security-Policy.

CNA Affected

[
  {
    "product": "security-advisories",
    "vendor": "nextcloud",
    "versions": [
      {
        "status": "affected",
        "version": "< 10.0.7"
      },
      {
        "status": "affected",
        "version": ">= 10.1.0, < 10.1.4"
      },
      {
        "status": "affected",
        "version": ">= 11.1.0, < 11.1.2"
      },
      {
        "status": "affected",
        "version": "< 11.2.0"
      },
      {
        "status": "affected",
        "version": ">= 12.0.0.alpha-1, < 12.0.0"
      }
    ]
  }
]