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CVE-2026-1323— 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 Mailqueue是Elias Häußler个人开发者的一个用于管理与发送邮件队列的扩展组件。 TYPO3 Mailqueue存在安全漏洞，该漏洞源于扩展未能正确定义反序列化传输失败元数据时使用的允许类，可能导致执行不受信任的序列化代码。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-1323

Vulnerability Information
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Vulnerability Title
Insecure Deserialization in extension "Mailqueue" (mailqueue)
Source: CVE Program / CVE List V5
Vulnerability Description
The extension fails to properly define allowed classes used when deserializing transport failure metadata. An attacker may exploit this to execute untrusted serialized code. Note that an active exploit requires write access to the directory configured at $GLOBALS['TYPO3_CONF_VARS']['MAIL']['transport_spool_filepath'].
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 Mailqueue 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TYPO3 Mailqueue是Elias Häußler个人开发者的一个用于管理与发送邮件队列的扩展组件。 TYPO3 Mailqueue存在安全漏洞，该漏洞源于扩展未能正确定义反序列化传输失败元数据时使用的允许类，可能导致执行不受信任的序列化代码。
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 ~ 0.4.5 -

II. Public POCs for CVE-2026-1323

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III. Intelligence Information for CVE-2026-1323

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Vendor Advisories for CVE-2026-1323 (1)

Same Patch Batch · TYPO3 · 2026-03-17 · 3 CVEs total

CVE-2026-4208 Authentication Bypass in extension "E-Mail MFA Provider" (mfa_email)
CVE-2026-4202 Broken Access Control in extension "Redirect Tab"

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-1323

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