CVE-2026-0895

Insecure Deserialization in extension "Mailqueue" (mailqueue)

5.2 MediumFix available

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 .

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: None

Exploit likelihood

0.15%Up 0.1 points since Jan 20, 2026

What each source reports

CVE List Score used 5.2

Insecure Deserialization in extension "Mailqueue" (mailqueue)

Record: CVE-2026-0895
CVSS 4.0: 5.2 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H
Weakness: CWE-502
Updated: 2026-11-02

EUVDEUVD-2026-3591 5.2

Record: EUVD-2026-3591
CVSS 4.0: 5.2 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-ggff-9mj3-7246 5.2

mailqueue TYPO3 extension affected by Insecure Deserialization in QueueableFileTransport

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.

References

Record: GHSA-ggff-9mj3-7246
CVSS 4.0: 5.2 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H
Weakness: CWE-502
Updated: 2026-11-02

NVD 5.2

Record: CVE-2026-0895
CVSS 4.0: 5.2 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-502
Updated: 2026-11-02

OSV 5.2

Insecure Deserialization in extension "Mailqueue" (mailqueue)

Record: CVE-2026-0895
CVSS 4.0: 5.2 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H
Weakness: CWE-502
Updated: 2026-11-02

OSVGHSA-ggff-9mj3-7246 5.2

mailqueue TYPO3 extension affected by Insecure Deserialization in QueueableFileTransport

Description

More information about this vulnerability can be found in the related TYPO3 Core Security Advisory TYPO3-CORE-SA-2026-004.

References

Record: GHSA-ggff-9mj3-7246
CVSS 4.0: 5.2 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H
Weakness: CWE-502
Updated: 2026-11-02

Affected products

typo3 extension "mailqueue"

Affected packages

Affected packages
Package	Affected	Fixed
`cpsit/typo3-mailqueue` Packagist	before 0.4.3	0.4.3
`cpsit/typo3-mailqueue` Packagist	0.5.0 up to 0.5.1	0.5.1
`cpsit/typo3-mailqueue` Packagist	before 0.4.3, plus listed versions 0.1.00.1.10.1.20.1.30.2.0 Show 7 moreShow less 0.2.10.3.00.3.10.3.20.4.00.4.10.4.2	0.4.3

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-0895 is a medium vulnerability (CVSS 5.2) in Typo3 Extension "mailqueue", published January 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.15%, the 4th percentile. Fixed in cpsit/typo3-mailqueue 0.4.3.