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                            CERT-Renater

                Note d'Information No. 2026/VULN068
_____________________________________________________________________

DATE                : 23/01/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running TYPO3 extension manager versions
                            prior to 0.5.1, 0.4.3.

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https://typo3.org/security/advisory/typo3-ext-sa-2026-001
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 Tue. 20th January, 2026
TYPO3-EXT-SA-2026-001: Insecure Deserialization in extension 
"Mailqueue" (mailqueue)
Categories: Development Created by Torben Hansen

It has been discovered that the extension "Mailqueue" (mailqueue) is 
vulnerable to insecure deserialization.

    Release Date: January 20, 2026
    Component Type: Third party extension. This extension is not a 
part of the TYPO3 default installation.
    Component: "Mailqueue" (mailqueue)
    Composer Package Name: cpsit/typo3-mailqueue
    Vulnerability Type: Insecure Deserialization
    Affected Versions: 0.5.0, 0.4.2 and below
    Severity: Medium
    Suggested CVSS v4.0: 
AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H
    References: CVE-2026-0895, CWE-502


Problem Description

The extension extends TYPO3’s FileSpool component, which was 
vulnerable to Insecure Deserialization prior to 
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.


Solution

Updated versions 0.5.1 and 0.4.3 are available from the TYPO3 
extension manager, packagist and at

https://extensions.typo3.org/extension/download/mailqueue/0.4.3/zip
https://extensions.typo3.org/extension/download/mailqueue/0.5.1/zip

Users of the extension are advised to update the extension as soon as 
possible.


Credits

Thanks to TYPO3 security team member Elias Häußler for reporting the 
vulnerability and for providing updated versions of the extension.


General Advice

Follow the recommendations that are given in the TYPO3 Security Guide. 
Please subscribe to the typo3-announce mailing list.

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