SB2020072732 - Cross-site scripting in wagtail CMS for Django

Description

This security bulletin contains information about 1 vulnerability.

1) Cross-site scripting (CVE-ID: CVE-2020-15118)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data withnin the help text in the "wagtail.contrib.forms" form builder app. A remote authenticated attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Remediation

Install update from vendor's website.

References

• https://docs.djangoproject.com/en/3.0/ref/models/fields/#django.db.models.Field.help_text
• https://docs.wagtail.io/en/stable/reference/contrib/forms/index.html#usage
• https://github.com/wagtail/wagtail/blob/master/docs/releases/2.9.3.rst
• https://github.com/wagtail/wagtail/commit/d9a41e7f24d08c024acc9a3094940199df94db34
• https://github.com/wagtail/wagtail/security/advisories/GHSA-2473-9hgq-j7xw