What’s Vulnerable › Vulnerabilities
CVE-2026-1323: Insecure Deserialization in extension "Mailqueue" (mailqueue)
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-17 · updated 2026-06-17
- Weakness: CWE-502
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'].
Affected products
- TYPO3 Extension "Mailqueue": before 0.4.5; from 0.5.0 before 0.5.2 — fixed in 0.4.5, 0.5.2
How to fix
Upgrade to a fixed version: TYPO3 Extension "Mailqueue" 0.4.5, 0.5.2. Check the vendor advisory for mitigations.
References
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