Read the docs
TI-2026-78784 Aliases CVE-2026-114403GHSA-q73p-x2mp-8gm9

Insecure deserialization in PHPOffice PHPPresentation allows code execution

Priority HIGH 75CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

PHPOffice PHPPresentation through 1.2.0 contains an insecure deserialization flaw that lets attackers instantiate arbitrary PHP objects through a crafted presentation file. An attacker can upload a ZIP containing PhpPresentation.xml, which IOFactory::load passes to unserialize(). This is exploitable without authentication and can lead to gadget-chain code execution, file writes, or denial of service.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00703 53rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PHPOfficePHPPresentationup to 1.2.0—No fix listedCNA
  • PHPPresentation VendorPHPOffice Affected up to 1.2.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for PHPOffice PHPPresentation.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-114403
  2. 2026-10-21 Alias added: GHSA-q73p-x2mp-8gm9
  3. 2026-10-28 CISA SSVC decision points changed
  4. 2026-10-28 Priority changed: MEDIUM → HIGH
  5. 2026-10-29 EPSS moved to the 50th–90th percentile

References

Advisory 1

Other 3

  • TI-2026-32885 PhpSpreadsheet: File::prohibitWrappers bypass CVSS 4.0CRITICAL 9.2
  • TI-2026-26406 PhpSpreadsheet SSRF and RCE via PHP stream wrappers in IOFactory::load CVSS 4.0CRITICAL 9.2
  • TI-2026-79412 PhpSpreadsheet ODS reader exhausts CPU and memory via repeated rows CVSS 4.0HIGH 8.7
  • TI-2025-34182 PhpSpreadsheet vulnerable to SSRF when reading and displaying a processed HTML document in the browser CVSS 4.0HIGH 8.7
  • TI-2024-37339 PhpSpreadsheet vulnerable to unauthorized reflected XSS in Currency.php file CVSS 4.0HIGH 8.3
  • TI-2024-37338 PhpSpreadsheet allows unauthorized reflected XSS in `Convert-Online.php` file CVSS 4.0HIGH 8.3
See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences