Cross-Site Scripting in TYPO3's Frontend Login Mailer

> ### Meta
> * CVSS: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C (4.9)

Problem

User submitted content was used without being properly encoded in HTML emails sent to users. The actually affected components were mail clients used to view those messages.

Solution

Update to TYPO3 versions 9.5.35 ELTS, 10.4.29, 11.5.11 that fix the problem described above.

Credits

Thanks to Christian Seifert who reported this issue and to TYPO3 framework merger Andreas Fernandez who fixed the issue.

References

• TYPO3-CORE-SA-2022-004