CVE-2026-114403
CVE-2026-114403
PHPOffice PHPPresentation through 1.2.0 contains an insecure deserialization vulnerability that allows attackers to instantiate arbitrary PHP objects by supplying a crafted presentation file. Attackers can upload a ZIP containing PhpPresentation.xml that IOFactory::load passes to unserialize(), enabling gadget-chain code execution, file writes, or denial of service.
Vulnerability class: Insecure Deserialization
Published .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- hackmd.io/@leediay/multiple_vulnerable_phppresentation (third-party-advisory)
- github.com/PHPOffice/PHPPresentation/blob/1.2.0/src/PhpPresentation/Reader/Seri… (technical-description)
- github.com/PHPOffice/PHPPresentation/blob/1.2.0/src/PhpPresentation/IOFactory.p… (technical-description)
- github.com/PHPOffice/PHPPresentation (product)
- www.vulncheck.com/advisories/phpoffice-phppresentation-through-1.2.0-deserializ… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-114403?
- CVE-2026-114403 is a high-severity vulnerability, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2026-10-21.
- How severe is CVE-2026-114403?
- High severity. CVSS v3 base score is 8.1 out of 10.