CVE-2021-32768

Cross-Site Scripting via Rich-Text Content

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.

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.47%
Vendor Advisory typo3.org
Affected: TYPO3 TYPO3.CMS
Published at:
Updated at:

References

Link Tags
https://typo3.org/security/advisory/typo3-core-sa-2021-013 vendor advisory
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-c5c9-8c6m-727v third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-32768?
CVE-2021-32768 has been scored as a medium severity vulnerability.
How to fix CVE-2021-32768?
To fix CVE-2021-32768, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-32768 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-32768 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-32768?
CVE-2021-32768 affects TYPO3 TYPO3.CMS.
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