LowGHSA-q9cp-mc96-m4w2BIT-typo3-2020-26229CVE-2020-26229

XML External Entity in Dashboard Widget

Published 23 Nov 2020 · Updated 8 Jul 2026

Affected packages

typo3/cms-coreComposer

Affected: >=10.0.0 <10.4.10
Fixed in: 10.4.10

Update to the fixed version for your release line, for example:composer require typo3/cms-core:^10.4.10

typo3/cmsComposer

Affected: >=10.0.0 <10.4.10
Fixed in: 10.4.10

Update to the fixed version for your release line, for example:composer require typo3/cms:^10.4.10

Details

Problem

It has been discovered that 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.

Solution

Update to TYPO3 version 10.4.10 that fixes the problem described.

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.