# CVE-2026-114403: PHPOffice PHPPresentation insecure deserialization

Source: https://junglewise.ai/threats/cve-2026-114403-phpoffice-phppresentation-through-1-2-0-contains-an-insecure  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-21. Updated: 2026-10-21  
License: CC BY 4.0 with a link back

CVE-2026-114403 · Severity: high · CVSS 8.1 · Published 2026-10-21

PHPOffice PHPPresentation is a PHP library for reading and writing presentation files. A vulnerability in version 1.2.0 and earlier allows attackers to upload a crafted presentation file that triggers unsafe deserialization of untrusted data, leading to arbitrary code execution, file writes, or application crashes.

Vendors: [Phpoffice](https://junglewise.ai/threats/vendors/phpoffice).

## Quick answers

**Is CVE-2026-114403 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-114403 being exploited in the wild.

**How severe is CVE-2026-114403?** High severity, with a CVSS score of 8.1, published 21 October 2026.

**Which products and versions are affected?** Phpoffice PHPPresentation through 1.2.0.

**Is there a fix for CVE-2026-114403?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-114403 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-114403?** Check whether you run Phpoffice PHPPresentation at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an insecure deserialization flaw in IOFactory::load() where untrusted presentation file contents are passed to PHP's unserialize() function without validation. An attacker can craft a malicious presentation file (ZIP containing a PhpPresentation.xml) that instantiates arbitrary PHP objects, enabling gadget-chain exploitation for code execution, file manipulation, or denial of service. No authentication or user interaction is required beyond uploading the file.

## Affected products

- PHPOffice PHPPresentation through 1.2.0

## Timeline

- 2026-10-21: disclosed

## References

- [https://github.com/PHPOffice/PHPPresentation](https://github.com/PHPOffice/PHPPresentation)
- [https://github.com/PHPOffice/PHPPresentation/blob/1.2.0/src/PhpPresentation/IOFactory.php](https://github.com/PHPOffice/PHPPresentation/blob/1.2.0/src/PhpPresentation/IOFactory.php)

## Related threats

- [PHPOffice PHPPresentation cross-site scripting in HTML writer](https://junglewise.ai/threats/cve-2026-114404-phpoffice-phppresentation-1-2-0-contains-a-cross-site-scripting)