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CriticalVulnerabilityCVE-2026-114403updated 25 Oct 2026, 19:06 UTC

PHPPresentation library can run attacker code via crafted slide files

A PHP library for reading presentation files can be tricked by a specially built file into running code on the server that opens it. Anyone who can upload a file to such a site could take it over or crash it.

Official, 2 sources
SeverityCriticalCVSS 9.2 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1AttackerCrafts a malicious presentation file
  2. 2UploadFile is submitted to the web app
  3. 3IOFactory::loadLibrary reads PhpPresentation.xml from the ZIP
  4. 4unserialize()Attacker-controlled data becomes PHP objects
  5. 5Gadget chainChained objects run code or write files
  6. ResultAttacker controls the server

What happened

PHPOffice PHPPresentation through version 1.2.0 passes data from the PhpPresentation.xml file inside a ZIP-based presentation to PHP's unserialize() via IOFactory::load, an insecure deserialization flaw that lets attackers instantiate arbitrary PHP objects.

Why it is dangerous: A crafted file can trigger gadget-chain code execution, arbitrary file writes, or denial of service on the server. Any web app that lets users upload and parse presentations with this library is at risk.

Are you affected?

You are affected if your application uses PHPOffice PHPPresentation version 1.2.0 or earlier and loads user-uploaded presentation files with IOFactory::load.

PHPOffice PHPPresentation through 1.2.0

What to do

  1. Check whether your project depends on PHPOffice PHPPresentation and which version is installed
  2. Stop loading untrusted uploaded presentation files with IOFactory::load until a fix is applied
  3. Watch the official PHPOffice project or the GitHub advisory for a patched release and update when it is published

Timeline

  1. 21 Oct 2026, 13:18 UTC
    Publicly disclosed
  2. 21 Oct 2026, 13:18 UTC
    Reported by NVD · NVD
  3. 25 Oct 2026, 19:06 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-114403 · GHSA-q73p-x2mp-8gm9
CVSS
9.2 / 10
EPSS
0.7% chance of exploitation within 30 days
Disclosed
21 Oct 2026, 13:18 UTC
On Zero Radar
before the radar started
Last change
25 Oct 2026, 19:06 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

PHPPresentation library can run attacker code via crafted slide files · Zero Radar