XSS in Typo3
CVE-2021-21370
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that content elements of type _menu_ are vulnerable to cross-site scripting when their referenced items get previewed in the page module. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.009 (55.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Typo3
- Typo3 Typo3.cms — versions >= 7.0.0, <= 7.6.50, >= 8.0.0, <= 8.7.39, >= 9.0.0, <= 9.5.24
Weakness classification (CWE)
References
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-21370?
- CVE-2021-21370 is a medium-severity vulnerability in Typo3, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-03-23.
- How severe is CVE-2021-21370?
- Medium severity. CVSS v3 base score is 5.4 out of 10.