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Typo3 CVE-2026-0859

HIGH
Deserialization of Untrusted Data (CWE-502)
2026-01-13 f4fb688c-4412-4426-b4b8-421ecf27b14a GHSA-7vp9-x248-9vr9
Typo3 PHP Deserialization
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
Patch released
Jan 14, 2026 - 18:57 nvd
Patch available
CVE Published
Jan 13, 2026 - 12:15 nvd
HIGH 7.8

DescriptionCVE.org

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.

AnalysisAI

Arbitrary PHP code execution in TYPO3 CMS versions 10.0.0 through 14.0.1 through unsafe deserialization of mail spool files, allowing local attackers with write access to the spool directory to execute malicious code when the mailer:spool:send command is executed. Affected versions span multiple release lines including 10.x, 11.x, 12.x, 13.x, and 14.x, requiring immediate patching to prevent web server compromise.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Write malicious serialized PHP object to spool directory
Exploit
TYPO3 executes mailer:spool:send command
Execution
Deserialize malicious file without validation
Impact
Execute arbitrary PHP code as web server
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Vulnerability AssessmentAI

Exploitation Local write access to TYPO3 mail-file spool directory. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker could exploit this vulnerability to compromise the affected system.
Remediation A vendor patch is available — apply it immediately. Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. …

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CVE-2026-0859 vulnerability details – vuln.today
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