CVE-2026-114403 PHPOffice PHPPresentation through 1.2.0 Deserialization via Reader\Serialized::load
Critical 9.2
Published
Updated
Check this codebase for CVE-2026-114403 and fix it if it is affected.
What it is: CVE-2026-114403 is a critical vulnerability in PHPOffice PHPPresentation, published on 21 Oct 2026.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-114403 exists.
Affected product: PHPOffice PHPPresentation. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-114403/ (Markdown: https://insights.sbomify.com/CVE-2026-114403/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-114403?
CVE-2026-114403 is a critical vulnerability in PHPOffice PHPPresentation, published on 21 Oct 2026.
Official description
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.
Weakness: CWE-502
Which versions are affected by CVE-2026-114403?
How do I fix CVE-2026-114403?
No fix has been published for CVE-2026-114403 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-114403 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-114403 exists.
Sources
Also known as GHSA-q73p-x2mp-8gm9.