What is CVE-2022-23520?

CVE-2022-23520 is a medium-severity vulnerability in Rails Rails-Html-Sanitizer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-12-14.

How severe is CVE-2022-23520?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2022-23520 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Rails Rails-Html-Sanitizer

CVE-2022-23520

rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Prior to version 1.4.4, there is a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer due to an incomplete fix of CVE-2022-32209. Rails::Html::Sanitizer may allow an attacker to inject content if the application developer has overridden the sanitizer's allowed tags to allow both "select" and "style" elements. Code is only impacted if allowed tags are being overridden. This issue is patched in version 1.4.4. All users overriding the allowed tags to include both "select" and "style" should either upgrade or use this workaround: Remove either "select" or "style" from the overridden allowed tags. NOTE: Code is _not_ impacted if allowed tags are overridden using either the :tags option to the Action View helper method sanitize or the :tags option to the instance method SafeListSanitizer#sanitize.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.011 (62.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Rails Rails-html-sanitizer — versions < 1.4.4
Rubyonrails Rails_html_sanitizers
Debian Debian_linux — versions 10.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
security-advisories@github.com (Exploit, Third Party Advisory, x_refsource_MISC)
security-advisories@github.com (Mailing List, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2022-23520?: CVE-2022-23520 is a medium-severity vulnerability in Rails Rails-Html-Sanitizer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-12-14.
How severe is CVE-2022-23520?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2022-23520 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.