CVE-2026-1323

High

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'].

SeverityHigh

CVSS8.8

Exploit probability—

ProductCps-it Mailqueue

PublishedMar 17, 2026

First seenMar 17, 2026

Weakness typeCWE-502Deserialization of untrusted data

How to fix

Update

cps-it mailqueue0.4.5, 0.5.2 or later
cpsit/typo3-mailqueue0.4.5, 0.5.2 or later

Vendor advisories

typo3.org/security/advisory/typo3-ext-sa-2026-005

Affected products

Product	Affected versions	Fixed in
cps-it mailqueue	v < 0.4.5, 0.5.0 ≤ v < 0.5.2	0.4.5, 0.5.2
cpsit/typo3-mailqueuePackagist	v < 0.4.5, 0.5.0 ≤ v < 0.5.2	0.4.5, 0.5.2

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