Remote Code Execution in extension "Site Crawler" (crawler)
Summary
| CVE | CVE-2026-8727 |
|---|---|
| State | PUBLISHED |
| Assigner | TYPO3 |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-19 10:16:25 UTC |
| Updated | 2026-05-19 14:47:13 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 7.1 HIGH from f4fb688c-4412-4426-b4b8-421ecf27b14a
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.005280000 probability, percentile 0.672950000 (date 2026-05-26)
Problem Types: CWE-502 | CWE-502 CWE-502 Deserialization of Untrusted Data
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | f4fb688c-4412-4426-b4b8-421ecf27b14a | Secondary | 7.1 | HIGH | 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/E:X/C... |
| 4.0 | CNA | CVSS | 7.1 | HIGH | 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 |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
HighAttack Requirements
PresentPrivileges Required
HighUser Interaction
ActiveConfidentiality
HighIntegrity
HighAvailability
HighSub Conf.
LowSub Integrity
LowSub Availability
LowCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | TYPO3 | Extension Site Crawler | affected 12.0.0 12.0.11 semver | Not specified |
| CNA | TYPO3 | Extension Site Crawler | affected 11.0.13 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| typo3.org/security/advisory/typo3-ext-sa-2026-008 | f4fb688c-4412-4426-b4b8-421ecf27b14a | typo3.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Roman Hergenreder (en)
CNA: Tomas Norre Mikkelsen (en)
There are currently no legacy QID mappings associated with this CVE.