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High, CVSS 7.1

TYPO3 Remote Code Execution in extension "Site Crawler" (crawler)

CVE-2026-8727GHSA-jr8m-x4p7-p3v5

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (tomasnorre/crawler 12.0.11, 11.0.13), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
7.1 · 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 · score source
EPSS
  • CVE-2026-8727: 0.39% estimated exploitation activity in the next 30 days; percentile 33.17 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

The TYPO3 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. This has been patched in versions 12.0.11 and 11.0.13.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-jr8m-x4p7-p3v5

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-8727

Advisory: TYPO3 Remote Code Execution in extension "Site Crawler" (crawler)
IDs: CVE-2026-8727, GHSA-jr8m-x4p7-p3v5
Record: https://patchnext.com/advisories/cve-2026-8727 (revision 1, source checked 26 Oct 2026, 14:49 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: tomasnorre/crawler 12.0.11, 11.0.13. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist tomasnorre/crawler: affected >= 12.0.0, < 12.0.11; < 11.0.13; fixed in 11.0.13, 12.0.11

## Suggested inspection (read-only)
- Packagist tomasnorre/crawler: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on tomasnorre/crawler.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-jr8m-x4p7-p3v5 (GitHub-reviewed advisory GHSA-jr8m-x4p7-p3v5 lists affected ranges: Packagist tomasnorre/crawler >=12.0.0 =0 <11.0.13)

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