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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.009 (57.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
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
- packagist.org/packages/typo3/cms-backend (Third Party Advisory, Release Notes)
- github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x7hc-x7fm-f7qh (Third Party Advisory)
- typo3.org/security/advisory/typo3-core-sa-2021-008 (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.