XSS in Typo3
CVE-2021-32768
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.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.007 (50.4th 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
- Typo3
- Typo3 Typo3.cms — versions >= 7.0.0, < 7.6.53, >= 8.0.0, < 8.7.42, >= 9.0.0, < 9.5.29
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC, Vendor Advisory)
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-32768?
- CVE-2021-32768 is a medium-severity vulnerability in Typo3, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-08-10.
- How severe is CVE-2021-32768?
- Medium severity. CVSS v3 base score is 6.1 out of 10.