CVE-2020-26229 XML External Entity in Dashboard Widget

What is CVE-2020-26229?

CVE-2020-26229 is a low-severity vulnerability in Typo3 Typo3, published on 23 Nov 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-611

Which versions are affected by CVE-2020-26229?

5 open source packages ship an affected version, including typo3/cms, typo3 and typo3/cms-core. It affects 1 product.

Products include Typo3 Typo3.

How do I fix CVE-2020-26229?

Upgrade typo3/cms to 10.4.10 or later.

Is CVE-2020-26229 being exploited?

There is no known exploitation of CVE-2020-26229 in the wild and no public exploit code.

Other vulnerabilities in Typo3 Typo3

• CVE-2009-0258 Indexed Search Engine for TYPO3 Command Execution via Metacharacter Injection Critical 10.0
• CVE-2011-3583 Typo3 SQL injection due to faulty prepared statements Critical 9.8
• CVE-2011-4628 Typo3 Authentication Bypass Critical 9.8
• CVE-2023-24814 Persisted Cross-Site Scripting in Frontend Rendering in typo3 High 8.8
• CVE-2021-41113 Cross-Site-Request-Forgery in Backend URI Handling in Typo3 High 8.8

All Typo3 Typo3 vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-typo3-2020-26229, GHSA-q9cp-mc96-m4w2.