Remote Code Execution in extension "Site Crawler" (crawler)
Priority LOW 33CWE-502Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Active
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-502.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0039 33rd percentileScored 2026-11-07
Fix Fixed Extension "Site Crawler" (TYPO3): 12.0.11, 11.0.13tomasnorre/crawler (Packagist): 12.0.11, 11.0.13
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| TYPO3 | Extension "Site Crawler" | 12.0.0 to before 12.0.11; before 11.0.13 | 12.0.11, 11.0.13 | Patch available | CNA |
| — | tomasnorre/crawler (Packagist) | 12.0.0 to before 12.0.11 | 12.0.11 | Patch available | GHSA-jr8m-x4p7-p3v5 |
| — | tomasnorre/crawler (Packagist) | before 11.0.13 | 11.0.13 | Patch available | GHSA-jr8m-x4p7-p3v5 |
- Extension "Site Crawler" VendorTYPO3 Affected 12.0.0 to before 12.0.11; before 11.0.13 Fixed in 12.0.11, 11.0.13 Patch available CNA
- tomasnorre/crawler (Packagist) Vendor— Affected 12.0.0 to before 12.0.11 Fixed in 12.0.11 Patch available GHSA-jr8m-x4p7-p3v5
- tomasnorre/crawler (Packagist) Vendor— Affected before 11.0.13 Fixed in 11.0.13 Patch available GHSA-jr8m-x4p7-p3v5
Remediation
- Fix · CNA Extension "Site Crawler" (TYPO3) Fixed in 12.0.11, 11.0.13
- Fix · GHSA-jr8m-x4p7-p3v5 tomasnorre/crawler (Packagist) Fixed in 12.0.11 Advisory →
- Fix · GHSA-jr8m-x4p7-p3v5 tomasnorre/crawler (Packagist) Fixed in 11.0.13 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-8727
- 2026-10-03 Alias added: GHSA-jr8m-x4p7-p3v5
References
More TYPO3 vulnerabilities
- TI-2023-10314 Persisted Cross-Site Scripting in Frontend Rendering in typo3 CVSS 3.1HIGH 8.8
- TI-2010-03538 The jumpUrl (aka access tracking) implementation in tslib/class.tslib_fe.php in TYPO3… CVSS 2.0HIGH 7.1
- TI-2009-00775 The jumpUrl mechanism in class.tslib_fe.php in TYPO3 3.3.x through 3.8.x, 4.0 before… CVSS 2.0MEDIUM 5.0
- TI-2025-30547 The sr_feuser_register extension through 12.4.8 for TYPO3 allows Remote Code Execution. CVSS 3.1CRITICAL 10.0
- TI-2019-08867 The PharStreamWrapper (aka phar-stream-wrapper) package 2.x before 2.1.1 and 3.x before… CVSS 3.1CRITICAL 9.8
- TI-2008-04019 Unspecified vulnerability in the TYPO3 Secure Directory (kw_secdir) extension before… CVSS 2.0HIGH 10.0
Sources
- CVE-2026-8727 · CVE Program
- CVE-2026-8727 · NVD
- FIRST EPSS
- GHSA-jr8m-x4p7-p3v5 · GitHub Advisory Database · CC BY 4.0
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