---
title: "CVE-2026-114403: PHPOffice PHPPresentation - Insecure Deserialization"
description: "PHPOffice PHPPresentation through 1.2.0 contains an insecure deserialization vulnerability caused by unserialize() usage in IOFactory::load with crafted presentation files, letting attackers execute code, write files, or cause denial of service, exploit requires crafted ZIP upload."
url: https://panop.io/threat-heartbeat/CVE-2026-114403/
---

# CVE-2026-114403 PHPOffice PHPPresentation - Insecure Deserialization

PHPOffice PHPPresentation through 1.2.0 contains an insecure deserialization vulnerability caused by unserialize() usage in IOFactory::load with crafted presentation files, letting attackers execute code, write files, or cause denial of service, exploit requires crafted ZIP upload.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-114403)

## Details

Type

Insecure Deserialization

Impact

Remote Code Execution, File System Write, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

21 October 2026

Updated

22 October 2026

Weakness

[CWE-502](https://cwe.mitre.org/data/definitions/502.html)

## Vendor fix

Update to the latest version beyond 1.2.0.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-114403](https://nvd.nist.gov/vuln/detail/CVE-2026-114403)
- [https://github.com/PHPOffice/PHPPresentation](https://github.com/PHPOffice/PHPPresentation)
- [https://github.com/PHPOffice/PHPPresentation/blob/1.2.0/src/PhpPresentation/IOFactory.php#L39](https://github.com/PHPOffice/PHPPresentation/blob/1.2.0/src/PhpPresentation/IOFactory.php#L39)
- [https://github.com/PHPOffice/PHPPresentation/blob/1.2.0/src/PhpPresentation/Reader/Serialized.php#L77-L109](https://github.com/PHPOffice/PHPPresentation/blob/1.2.0/src/PhpPresentation/Reader/Serialized.php#L77-L109)
- [https://hackmd.io/@leediay/multiple\_vulnerable\_phppresentation](https://hackmd.io/@leediay/multiple_vulnerable_phppresentation)
- [https://www.vulncheck.com/advisories/phpoffice-phppresentation-through-1.2.0-deserialization-via-reader-serialized-load](https://www.vulncheck.com/advisories/phpoffice-phppresentation-through-1.2.0-deserialization-via-reader-serialized-load)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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