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.

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)

EPSS: 0.006 (46.8th percentile) — read the EPSS interpretation.

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.

Affected products

Typo3
Typo3 Typo3.cms — versions >= 10.0.0, < 10.4.10

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

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-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.