CVE-2021-29434 Improper validation of URLs ('Cross-site Scripting') in Wagtail rich text fields

2021-04-1918:45:14

CWE-79

GitHub_M

www.cve.org

cve-2021-29434

wagtail

django content management

cross-site scripting

admin interface

server-side checks

javascript urls

github advisory

patched versions

CVSS3

6.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

EPSS

0.001

Percentile

19.4%

JSON

Wagtail is a Django content management system. In affected versions of Wagtail, when saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with javascript: URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. See referenced GitHub advisory for additional details, including a workaround. Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).

CNA Affected

[
  {
    "product": "wagtail",
    "vendor": "wagtail",
    "versions": [
      {
        "status": "affected",
        "version": "<= 2.11.6"
      },
      {
        "status": "affected",
        "version": ">= 2.12, <= 2.12.3"
      }
    ]
  }
]