Deserialization in TYPO3
CVE-2026-0859
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Affected products
Weakness classification (CWE)
References
- f4fb688c-4412-4426-b4b8-421ecf27b14a (vendor-advisory, Vendor Advisory)
- f4fb688c-4412-4426-b4b8-421ecf27b14a (Patch, patch)
- f4fb688c-4412-4426-b4b8-421ecf27b14a (Patch, patch)
- f4fb688c-4412-4426-b4b8-421ecf27b14a (Patch, patch)
Frequently asked questions
- What is CVE-2026-0859?
- CVE-2026-0859 is a high-severity vulnerability in TYPO3, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2026-01-13.
- How severe is CVE-2026-0859?
- High severity. CVSS v3 base score is 7.8 out of 10.