Vulnerability advisory

GHSA-q9cp-mc96-m4w2

XML External Entity in Dashboard Widget

Published Nov 23, 2020Updated Jul 8, 2026OSV record ↗

Also known as BIT-typo3-2020-26229CVE-2020-26229

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L

Affected versions

typo3/cms-core Packagist

All typo3/cms-core advisories →

Affected	Fixed in
`10.0.0` to before 10.4.10	`10.4.10`Advisories →
Also listed as affected (16) `v10.0.0` `v10.1.0` `v10.2.0` `v10.2.1` `v10.2.2` `v10.3.0` `v10.4.0` `v10.4.1` `v10.4.2` `v10.4.3` `v10.4.4` `v10.4.5` `v10.4.6` `v10.4.7` `v10.4.8` `v10.4.9`

typo3/cms Packagist

All typo3/cms advisories →

Affected	Fixed in
`10.0.0` to before 10.4.10	`10.4.10`Advisories →
Also listed as affected (16) `v10.0.0` `v10.1.0` `v10.2.0` `v10.2.1` `v10.2.2` `v10.3.0` `v10.4.0` `v10.4.1` `v10.4.2` `v10.4.3` `v10.4.4` `v10.4.5` `v10.4.6` `v10.4.7` `v10.4.8` `v10.4.9`

Description

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.