Cross-Site Scripting in Content Preview

中 5.4CVE-2021-21340 · BIT-typo3-2021-21340 · GHSA-fjh3-g8gq-9q92 · 23/03/2021 公開 · 17/06/2026 更新

要点

CVE-2021-21340 は typo3/cms, typo3/cms-backend, typo3/cms-core に影響する深刻度「中」 (CVSS 5.4) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.87%（全脆弱性の 58.9% より高い）。
対処：10.4.14, 11.1.1 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
typo3/cms Packagist	`≥ 10.0.0, < 10.4.14≥ 11.0.0, < 11.1.1`	`10.4.1411.1.1`
typo3/cms-backend Packagist	`≥ 10.0.0, < 10.4.14≥ 11.0.0, < 11.1.1`	`10.4.1411.1.1`
typo3/cms-core Packagist	`≥ 10.0.0, < 10.4.14≥ 11.0.0, < 11.1.1`	`10.4.1411.1.1`
typo3 typo3	`≥ 10.0.0, < 10.4.14≥ 11.0.0, < 11.1.1`	`10.4.1411.1.1`

概要

Problem

It has been discovered that database fields used as descriptionColumn are vulnerable to cross-site scripting when their content gets previewed in the page module. A valid backend user account is needed to exploit this vulnerability.

Solution

Update to TYPO3 versions 10.4.14, 11.1.1 that fix the problem described.

Credits

Thanks to Richie Lee who reported this issue and to TYPO3 framework merger Andreas Fernandez who fixed the issue.

References

TYPO3-CORE-SA-2021-007

NVD の説明

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that database fields used as _descriptionColumn_ are vulnerable to cross-site scripting when their content gets previewed. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1 .