TYPO3's mail‑file spool deserialization flaw lets local users with write access to the spool directory craft a malicious file that is deserialized during the mailer:spool:send command, enabling arbitrary PHP code execution on the web server. This issue affects TYPO3 CMS versions 10.0.0-10.4.54, 11.0.0-11.5.48, 12.0.0-12.4.40, 13.0.0-13.4.22 and 14.0.0-14.0.1.
{
"cna_assigner": "TYPO3",
"cwe_ids": [
"CWE-502"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0859.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "10.0.0"
},
{
"fixed": "10.4.55"
},
{
"introduced": "11.0.0"
},
{
"fixed": "11.5.49"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
]
}{
"extracted_events": [
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "14.0.0"
},
{
"fixed": "14.0.2"
}
],
"source": "CPE_RANGE"
}
]
}
{
"extracted_events": [
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "12.0.0"
},
{
"fixed": "12.4.41"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "13.0.0"
},
{
"fixed": "13.4.23"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "14.0.0"
},
{
"fixed": "14.0.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "3225d705080a1bde57a66689621c947da5a4782f"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "722bf71c118b0a8e4f2c2494854437d846799a13"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "e0f0ceee480c203fbb60b87454f5f193e541d27f"
}
],
"source": "REFERENCES_COMMIT"
}
]
}