CVE-2026-0859
highpriority · track · 31EPSS 0.002 · 8 %ileDEEUNLUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 1.3–7.8
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (27)
Products and version ranges known to be affected.
advisories (3)
Vendor and ecosystem advisories describing this.
- NCSC-2026-0018Kwetsbaarheden verholpen in TYPO3 CMSNL2026-01-16csaf · ncsc_nlNL
TYPO3 heeft kwetsbaarheden verholpen in TYPO3 CMS (Specifiek voor bepaalde versies).
- WID-SEC-W-2026-0095TYPO3 Core: Mehrere SchwachstellenDeutsch2026-01-13csaf · cert_bundDE
Ein entfernter, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen in TYPO3 Core ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Daten zu manipulieren, beliebigen Code auszuführen, vertrauliche Informationen offenzulegen, um potenziell Phishing-Angriffe durchzuführen oder einen Denial-of-Service-Zustand zu erzeugen.
- GHSA-7vp9-x248-9vr9TYPO3 CMS Allows Insecure Deserialization via Mailer File Spool2026-01-13ghsa · osvUS
### Problem Local platform users who can write to TYPO3’s mail‑file spool directory can craft a file that the system will automatically deserialize without any class restrictions. This flaw allows an attacker to inject and execute arbitrary PHP code in the public scope of the web server. The vulnerability is triggered when TYPO3 is configured with `$GLOBALS['TYPO3_CONF_VARS']['MAIL']['transport_spool_type'] = 'file';` and a scheduler task or cron job runs the command `mailer:spool:send`. The spool‑send operation performs the insecure deserialization that is at the core of this issue. ### Solution Update to TYPO3 versions 10.4.55 ELTS, 11.5.49 ELTS, 12.4.41 LTS, 13.4.23 LTS, 14.0.2 that fix the problem described. ### Credits Thanks to Vitaly Simonovich for reporting this issue, and to TYPO3 security team members Elias Häußler and Oliver Hader for fixing it. ### References * [TYPO3-CORE-SA-2026-004](https://typo3.org/security/advisory/typo3-core-sa-2026-004)
also known as (3)
Other names and identifiers for this entity.
sources
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references (12)
External citations — patches, advisories, analysis.
- https://github.com/TYPO3/typo3/commit/3225d705080a1bde57a66689621c947da5a4782fcnnvd
- https://github.com/TYPO3/typo3/commit/722bf71c118b0a8e4f2c2494854437d846799a13cnnvd
- https://github.com/TYPO3/typo3/commit/e0f0ceee480c203fbb60b87454f5f193e541d27fcnnvd
- https://typo3.org/security/advisory/typo3-core-sa-2026-004cnnvd
- https://github.com/TYPO3/typo3/commit/3225d705080a1bde57a66689621c947da5a4782fenisa_euvd
- https://github.com/TYPO3/typo3/commit/722bf71c118b0a8e4f2c2494854437d846799a13enisa_euvd
- https://github.com/TYPO3/typo3/commit/e0f0ceee480c203fbb60b87454f5f193e541d27fenisa_euvd
- https://typo3.org/security/advisory/typo3-core-sa-2026-004enisa_euvd
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