Meta

• CVSS v3.1: AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C
• CWE-79

Problem

It has been discovered that HTML placeholder attributes containing data of other database records are vulnerable to cross-site scripting. A valid backend user account is needed to exploit this vulnerability.

Solution

Update to TYPO3 versions 9.5.17 or 10.4.2 that fix the problem described.

Credits

Thanks to Florian Weiss who reported this issue and to TYPO3 active contributor Markus Klein who fixed the issue.

References

• https://typo3.org/security/advisory/typo3-core-sa-2020-002