XXE in TYPO3
CVE-2020-26229
TYPO3 is an open source PHP based web content management system. In TYPO3 from version 10.4.0, and before version 10.4.10, RSS widgets are susceptible to XML external entity processing. This vulnerability is reasonable, but is theoretical - it was not possible to actually reproduce the vulnerability with current PHP versions of supported and maintained system distributions. At least with libxml2 version 2.9, the processing of XML external entities is disabled per default - and cannot be exploited. Besides that, a valid backend user account is needed. Update to TYPO3 version 10.4.10 to fix the problem described.
Vulnerability class: XXE (XML External Entity)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (48.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- TYPO3
- TYPO3 Typo3.cms — versions >= 10.0.0, < 10.4.10
Weakness classification (CWE)
References
- github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-q9cp-mc96-m4w2 (Third Party Advisory)
- typo3.org/security/advisory/typo3-core-sa-2020-012 (Vendor Advisory)
Frequently asked questions
- What is CVE-2020-26229?
- CVE-2020-26229 is a low-severity vulnerability in TYPO3, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 3.7/10. Published 2020-11-23.
- How severe is CVE-2020-26229?
- Low severity. CVSS v3 base score is 3.7 out of 10.