Vulnerability · Published Jan 20, 2026 · Assigned by TYPO3
CVE-2026-0895Insecure Deserialization in extension "Mailqueue" (mailqueue)
Medium 5.2
In plain English
A medium-severity unsafe deserialization in Extension "Mailqueue" from TYPO3. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
The extension extends TYPO3’ FileSpool component, which was vulnerable to Insecure Deserialization prior to TYPO3-CORE-SA-2026-004 https://typo3.org/security/advisory/typo3-core-sa-2026-004 . Since the related fix is overwritten by the extension, using the extension with a patched TYPO3 core version still allows for Insecure Deserialization, because the affected vulnerable code was extracted from TYPO3 core to the extension. More information about this vulnerability can be found in the related TYPO3 Core Security Advisory TYPO3-CORE-SA-2026-004 https://typo3.org/security/advisory/typo3-core-sa-2026-004 .
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | cpsit/typo3-mailqueue | 0.4.3 | GHSA-ggff-9mj3-7246 |
| Packagist | cpsit/typo3-mailqueue | 0.5.1 | GHSA-ggff-9mj3-7246 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TYPO3 | Extension "Mailqueue" | 0 – before 0.4.30.5.0 – before 0.5.1 |
Weakness: CWE-502 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H