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CVE-2026-1323 — Vulnerability in cpsit/typo3-mailqueue — CVE Details

MEDIUM

The mailqueue TYPO3 extension has Insecure Deserialization in `TransportFailure` class

Published March 18, 2026Updated May 5, 2026Source: osv

Summary

## 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']`.

Advisory Timeline

  • First published March 18, 2026 (208 days ago).
  • Last revised May 5, 2026 — 48 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer
Update cpsit/typo3-mailqueue to 0.5.2 or later
composer require "cpsit/typo3-mailqueue:^0.5.2"
Composer
Update cpsit/typo3-mailqueue to 0.4.5 or later
composer require "cpsit/typo3-mailqueue:^0.4.5"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: packagist (1).

PackageEcosystemAffectedFixed In
cpsit/typo3-mailqueue
packagist
0.5.0, 0.5.10.5.2
cpsit/typo3-mailqueue
packagist
0.1.0, 0.1.1, 0.1.2, 0.1.3 (+10 more)0.4.5

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-1323?
The mailqueue TYPO3 extension has Insecure Deserialization in `TransportFailure` class This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 8.8/10).
How do I check if my project is affected by CVE-2026-1323?
CVE-2026-1323 affects cpsit/typo3-mailqueue. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-1323 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.8

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-2pm6-9fhx-vvg3

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  • CVE-2026-0895
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    mailqueue TYPO3 extension affected by Insecure Deserialization in QueueableFileTransport

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