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CVE-2026-0859

7.8 · HIGH

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 arb…

Published Jan 13, 2026CWE-502EPSS 0.18%

Overview

CVE-2026-0859 is a high-severity vulnerability. It was published on January 13, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/TYPO3/typo3/commit/3225d705080a1bde57a66689621c947da5a4782fGitHubgithub.com/TYPO3/typo3/commit/722bf71c118b0a8e4f2c2494854437d846799a13GitHubgithub.com/TYPO3/typo3/commit/e0f0ceee480c203fbb60b87454f5f193e541d27fReftypo3.org/security/advisory/typo3-core-sa-2026-004

How CyberStrike helps

Frequently asked questions

What is CVE-2026-0859?

CVE-2026-0859 is a high-severity vulnerability. It was published on January 13, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-0859?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-0859?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-0859?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-0859 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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