CVE-2021-32768

Description

TYPO3 is an open source PHP based web content management system released under the GNU GPL. In affected versions failing to properly parse, sanitize and encode malicious rich-text content, the content rendering process in the website frontend is vulnerable to cross-site scripting. Corresponding rendering instructions via TypoScript functionality HTMLparser does not consider all potentially malicious HTML tag & attribute combinations per default. In default scenarios, a valid backend user account is needed to exploit this vulnerability. In case custom plugins used in the website frontend accept and reflect rich-text content submitted by users, no authentication is required. Update to TYPO3 versions 7.6.53 ELTS, 8.7.42 ELTS, 9.5.29, 10.4.19, 11.3.2 that fix the problem described.

How to fix CVE-2021-32768

To remediate CVE-2021-32768, upgrade the affected package to a fixed version below.

• —upgrade to 10.4.19 or later
• —upgrade to 7.6.53 or later

Is CVE-2021-32768 being exploited?

Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• >= 10.0.0, < 10.4.19
• >= 7.0.0, < 7.6.53

CVSS scores

References (6)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-32768
• WEBgithub.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-32768.yaml
• WEBgithub.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-32768.yaml
• WEBgithub.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-c5c9-8c6m-727v