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CVE-2026-0895— Insecure Deserialization in extension "Mailqueue" (mailqueue)

Quick assessment

Affected
TYPO3 Extension "Mailqueue"
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TYPO3 extension mailqueue是TYPO3开源的一个邮件扩展。 TYPO3 extension mailqueue存在安全漏洞，该漏洞源于不安全的反序列化。

AI Predicted 9.8 Difficulty: Easy EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services
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I. Basic Information for CVE-2026-0895

Vulnerability Information
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Vulnerability Title
Insecure Deserialization in extension "Mailqueue" (mailqueue)
Source: CVE Program / CVE List V5
Vulnerability 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 .
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
TYPO3 extension mailqueue 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TYPO3 extension mailqueue是TYPO3开源的一个邮件扩展。 TYPO3 extension mailqueue存在安全漏洞，该漏洞源于不安全的反序列化。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TYPO3 Extension "Mailqueue" 0 ~ 0.4.3 -

II. Public POCs for CVE-2026-0895

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III. Intelligence Information for CVE-2026-0895

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IV. Related Vulnerabilities

Same product: Extension "Mailqueue"
Same vendor: TYPO3
Same weakness: CWE-502

V. Comments for CVE-2026-0895

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