CVE-2026-1323
Insecure Deserialization in extension "Mailqueue" (mailqueue)
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'].
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
What each source reports
CVE List Score used
Insecure Deserialization in extension "Mailqueue" (mailqueue)
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'].
- Record
CVE-2026-1323- CVSS 4.0
- 5.2 Medium
CVSS: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-2026-12548
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'].
- Record
EUVD-2026-12548- CVSS 4.0
- 5.2 Medium
CVSS: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-2pm6-9fhx-vvg3
The mailqueue TYPO3 extension has Insecure Deserialization in `TransportFailure` class
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'].
- Record
GHSA-2pm6-9fhx-vvg3- CVSS 4.0
- 5.2 Medium
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
NVD
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'].
- Record
CVE-2026-1323- CVSS 4.0
- 5.2 Medium
CVSS: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 - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
OSV
Insecure Deserialization in extension "Mailqueue" (mailqueue)
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'].
- Record
CVE-2026-1323- CVSS 4.0
- 5.2 Medium
CVSS: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-2pm6-9fhx-vvg3
The mailqueue TYPO3 extension has Insecure Deserialization in `TransportFailure` class
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'].
- Record
GHSA-2pm6-9fhx-vvg3- CVSS 4.0
- 5.2 Medium
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
cpsit/typo3-mailqueuePackagist |
before 0.4.5 | 0.4.5 |
cpsit/typo3-mailqueuePackagist |
0.5.0 up to 0.5.2 | 0.5.2 |
cpsit/typo3-mailqueuePackagist |
before 0.4.5, plus listed versions 0.1.00.1.10.1.20.1.30.2.0 Show 9 moreShow less0.2.10.3.00.3.10.3.20.4.00.4.10.4.20.4.30.4.4 |
0.4.5 |
cpsit/typo3-mailqueuePackagist |
0.5.0 up to 0.5.2, plus listed versions 0.5.1 |
0.5.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-1323 is a medium vulnerability (CVSS 5.2) in Cps-it Mailqueue, published March 17, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.23%, the 13th percentile. Fixed in cpsit/typo3-mailqueue 0.4.5.
References
typo3.org/security/advisory/typo3-ext-sa-2026-005
github.com/CPS-IT/mailqueue/security/advisories/GHSA-2pm6-9fhx-vvg3
nvd.nist.gov/vuln/detail/CVE-2026-1323
packagist.org