CVE-2026-114403: Deserialization of Untrusted Data in PHPOffice PHPPresentation
Description
PHPOffice PHPPresentation versions up to 1.2.0 contain a critical insecure deserialization vulnerability. This flaw allows attackers to craft presentation files that trigger unsafe PHP object instantiation during file loading. Exploitation can lead to arbitrary code execution, file writes, or denial of service without requiring user interaction or privileges.
CVSS v4.0
Score 9.2critical
Affected software
PHPOffice
PHPPresentation
pkg:github/PHPPresentationRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
PHPOffice PHPPresentation through version 1.2.0 is vulnerable to insecure deserialization. An attacker can upload a specially crafted ZIP archive containing a PhpPresentation.xml file. When the application uses IOFactory::load to process this file, it passes data to PHP's unserialize() function without sufficient validation. This enables the attacker to instantiate arbitrary PHP objects, potentially triggering gadget chains that result in code execution, file manipulation, or denial of service conditions.
Potential Impact
Successful exploitation can allow remote attackers to execute arbitrary PHP code, write files, or cause denial of service on affected systems. The vulnerability requires no privileges or user interaction, making it highly impactful. The CVSS 4.0 base score of 9.2 reflects the critical severity and ease of exploitation.
Mitigation Recommendations
No official patch or remediation information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid processing untrusted presentation files with PHPPresentation or implement strict input validation and sandboxing measures.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-21T11:46:45.745Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad8b86d2cdf04f656f0cacf
Added to database: 10/21/2026, 13:04:45 UTC
Last enriched: 10/21/2026, 13:16:08 UTC
Last updated: 10/21/2026, 13:40:20 UTC
Views: 14
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