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CVE-2023-36823

7.1 · HIGH

Sanitize is an allowlist-based HTML and CSS sanitizer.

Published Jul 6, 2023CWE-79EPSS 0.71%

Overview

CVE-2023-36823 is a high-severity vulnerability. It was published on July 6, 2023 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Sanitize is an allowlist-based HTML and CSS sanitizer. Using carefully crafted input, an attacker may be able to sneak arbitrary HTML and CSS through Sanitize starting with version 3.0.0 and prior to version 6.0.2 when Sanitize is configured to use the built-in "relaxed" config or when using a custom config that allows `style` elements and one or more CSS at-rules. This could result in cross-site scripting or other undesired behavior when the malicious HTML and CSS are rendered in a browser. Sanitize 6.0.2 performs additional escaping of CSS in `style` element content, which fixes this issue. Users who are unable to upgrade can prevent this issue by using a Sanitize config that doesn't allow `style` elements, using a Sanitize config that doesn't allow CSS at-rules, or by manually escaping the character sequence `</` as `<\/` in `style` element content.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/rgrove/sanitize/commit/76ed46e6dc70820f38efe27de8dabd54dddb5220GitHubgithub.com/rgrove/sanitize/releases/tag/v6.0.2GitHubgithub.com/rgrove/sanitize/security/advisories/GHSA-f5ww-cq3m-q3g7Reflists.debian.org/debian-lts-announce/2023/11/msg00008.htmlGitHubgithub.com/rgrove/sanitize/commit/76ed46e6dc70820f38efe27de8dabd54dddb5220GitHubgithub.com/rgrove/sanitize/releases/tag/v6.0.2GitHubgithub.com/rgrove/sanitize/security/advisories/GHSA-f5ww-cq3m-q3g7Reflists.debian.org/debian-lts-announce/2023/11/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2023-36823?

CVE-2023-36823 is a high-severity vulnerability. It was published on July 6, 2023 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2023-36823?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-36823?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-36823?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-36823 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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