Deserialization in Cps-It Mailqueue
CVE-2026-1323
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'].
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (10.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Cps-It Mailqueue
- TYPO3 Extension "Mailqueue" — versions 0, 0.5.0
Weakness classification (CWE)
References
- f4fb688c-4412-4426-b4b8-421ecf27b14a (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-1323?
- CVE-2026-1323 is a high-severity vulnerability in Cps-It Mailqueue, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-03-17.
- How severe is CVE-2026-1323?
- High severity. CVSS v3 base score is 8.8 out of 10.