Mailqueue Extension up to 0.4.2/0.5.0 on TYPO3 Filepool deserialization

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Mailqueue Extension up to 0.4.2/0.5.0 on TYPO3. It has been rated as critical. Impacted is an unknown function of the component Filepool. This manipulation causes deserialization. The identification of this vulnerability is CVE-2026-0895. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Mailqueue Extension up to 0.4.2/0.5.0 on TYPO3. Affected by this vulnerability is an unknown function of the component Filepool. The manipulation with an unknown input leads to a deserialization vulnerability. The CWE definition for the vulnerability is CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The extension extends TYPO3’ FileSpool component, which was vulnerable to Insecure Deserialization prior to TYPO3-CORE-SA-2026-004 https://typo3.org/security/advisory/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 https://typo3.org/security/advisory/typo3-core-sa-2026-004 .

The advisory is shared at typo3.org. This vulnerability is known as CVE-2026-0895 since 01/13/2026. The exploitation appears to be easy. The attack can be launched remotely. Neither technical details nor an exploit are publicly available.

Upgrading to version 0.4.3 or 0.5.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0151). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • TYPO3 Extension

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Deserialization
CWE: CWE-502 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mailqueue Extension 0.4.3/0.5.1

Timelineinfo

01/13/2026 CVE reserved
01/20/2026 +7 days Advisory disclosed
01/20/2026 +0 days VulDB entry created
01/20/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: typo3.org
Status: Confirmed

CVE: CVE-2026-0895 (🔒)
GCVE (CVE): GCVE-0-2026-0895
GCVE (VulDB): GCVE-100-341929
CERT Bund: WID-SEC-2026-0151 - TYPO3 Extension: Mehrere Schwachstellen ermöglichen Manipulation von Dateien

Entryinfo

Created: 01/20/2026 09:05
Updated: 01/20/2026 12:54
Changes: 01/20/2026 09:05 (66), 01/20/2026 12:54 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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