CVE-2026-27543 WordPress MStore API plugin <= 4.20.0 - Privilege Escalation vulnerability
High 8.1
Published
Updated
Check this codebase for CVE-2026-27543 and fix it if it is affected.
What it is: CVE-2026-27543 is a high-severity vulnerability in FluxBuilder MStore API, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-27543 in the wild and no public exploit code.
Affected product: FluxBuilder MStore API. 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-2026-27543/ (Markdown: https://insights.sbomify.com/CVE-2026-27543/index.md)
Unauthenticated attackers can escalate privileges in the MStore API WordPress plugin, allowing unauthorized access to higher-level functions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27543?
CVE-2026-27543 is a high-severity vulnerability in FluxBuilder MStore API, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Unauthenticated Privilege Escalation in MStore API <= 4.20.0 versions.
Weakness: CWE-266
Which versions are affected by CVE-2026-27543?
How do I fix CVE-2026-27543?
No fix has been published for CVE-2026-27543 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-27543 being exploited?
There is no known exploitation of CVE-2026-27543 in the wild and no public exploit code.
Sources
Also known as GHSA-cvhf-m4qh-hf7x.