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.
{
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8727.json",
"cwe_ids": [
"CWE-502"
],
"cna_assigner": "TYPO3"
}{
"source": "AFFECTED_FIELD",
"extracted_events": [
{
"introduced": "12.0.0"
},
{
"fixed": "12.0.11"
},
{
"introduced": "0"
},
{
"fixed": "11.0.13"
}
]
}