PT-2026-25877 · Typo3 · Typo3

Elias Häußler · Published 2026-03-17 · Updated 2026-03-18 · CVE-2026-1323

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions TYPO3 (affected versions not specified)

Description The extension does not correctly define allowed classes when deserializing transport failure metadata. This can be exploited by an attacker to execute untrusted serialized code. An active exploit requires write access to the directory configured at $GLOBALS['TYPO3 CONF VARS']['MAIL']['transport spool filepath'].

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-1323

GHSA-2PM6-9FHX-VVG3

Affected Products

Typo3

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-1323 · Security Note
• https://typo3.org/security/advisory/typo3-ext-sa-2026-005 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-2pm6-9fhx-vvg3 · Vendor Advisory
• https://github.com/CPS-IT/mailqueue · Note
• https://github.com/CPS-IT/mailqueue/commit/600c7dba99f8eea5f2505b848ee3dd4713440741 · Note
• https://github.com/CPS-IT/mailqueue/commit/0f7a1376bbbd8c7658030d02e51c10a85b1dfdf7 · Note
• https://github.com/CPS-IT/mailqueue/security/advisories/GHSA-2pm6-9fhx-vvg3 · Note
• https://twitter.com/CVEnew/status/2033994290712748275 · Twitter Post
• https://twitter.com/CVEarity/status/2033955626246902012 · Twitter Post