CVE-2026-1323

Code execution via misspelled deserialization allowlist

Published Mar 17, 2026 · Updated Mar 17, 2026

Insecure deserialization in TYPO3 Mailqueue before 0.4.5 and 0.5.0 through 0.5.1 allows local users to execute untrusted serialized code. TransportFailure::fromFile reads spool metadata into PHP unserialize(), but misspells allowed_classes as allowedClasses, so PHP applies no class allowlist. Exploitation requires write access to the configured mail transport spool directory and can execute gadget code in the TYPO3 process context.

CVSS severity5.2
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure deserialization in TYPO3 Mailqueue before 0.4.5 and 0.5.0 through 0.5.1 allows local users to execute untrusted serialized code. TransportFailure::fromFile reads spool metadata into PHP unserialize(), but misspells allowed_classes as allowedClasses, so PHP applies no class allowlist. Exploitation requires write access to the configured mail transport spool directory and can execute gadget code in the TYPO3 process context.

The record

CVE
CVE-2026-1323
Published
Mar 17, 2026
Updated
Mar 17, 2026
Vendor
in2code GmbH
Product
Mailqueue
Classifications
CWE-502, CAPEC-586
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.4.5
  2. Affected versionversion=0.5.0 <0.5.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

in2code GmbH · Mailqueueversion=0 <0.4.5; version=0.5.0 <0.5.2

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.2TYPO3CVSS: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 describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-586Object Injection

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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