Cross-site scripting in wagtail CMS for Django

1) Cross-site scripting

EUVDB-ID: #VU31888

Risk: Low

CVSSv4.0: 1.2 [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]

CVE-ID: CVE-2020-15118

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

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

wagtail: 2.7 - 2.9.2

CPE2.3

• cpe:2.3:a:torchbox:wagtail:2.7:*:*:*:*:django:*:*
• cpe:2.3:a:torchbox:wagtail:2.7.1:*:*:*:*:django:*:*
• cpe:2.3:a:torchbox:wagtail:2.7.2:*:*:*:*:django:*:*

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.