CVE-2026-111832 WordPress WP Mailster plugin <= 1.9.1.0 - Arbitrary File Upload vulnerability
Critical 10.0
Published
Updated
Check this codebase for CVE-2026-111832 and fix it if it is affected.
What it is: CVE-2026-111832 is a critical vulnerability in WP Mailster, published on 21 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-111832 in the wild and no public exploit code.
Affected product: WP Mailster. 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-2026-111832/ (Markdown: https://insights.sbomify.com/CVE-2026-111832/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-111832?
CVE-2026-111832 is a critical vulnerability in WP Mailster, published on 21 Oct 2026.
Official description
Unrestricted Upload of File with Dangerous Type vulnerability in WP Mailster WP Mailster wp-mailster allows Upload a Web Shell to a Web Server.This issue affects WP Mailster: from n/a through 1.9.1.0.
Weakness: CWE-434
Which versions are affected by CVE-2026-111832?
How do I fix CVE-2026-111832?
No fix has been published for CVE-2026-111832 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-111832 being exploited?
There is no known exploitation of CVE-2026-111832 in the wild and no public exploit code.
Sources
Also known as GHSA-2hrr-86cg-w5v9.