CVE-2026-111958 Royal MCP < 1.5.7 - Authentication Bypass via Preview Link Token
High 7.5
Published
Updated
Check this codebase for CVE-2026-111958 and fix it if it is affected.
What it is: CVE-2026-111958 is a high-severity vulnerability in Unknown Royal MCP, published on 22 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-111958 in the wild and no public exploit code.
Affected product: Unknown Royal MCP. 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-2026-111958/ (Markdown: https://insights.sbomify.com/CVE-2026-111958/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-111958?
CVE-2026-111958 is a high-severity vulnerability in Unknown Royal MCP, published on 22 Oct 2026.
Official description
The Royal MCP WordPress plugin before 1.5.7 does not limit a preview-link token to the single preview it was issued for, so any party that obtains a valid token is authenticated as the token's owning user, an administrator in the default configuration, across the entire REST API with no nonce, leading to full site takeover.
Weakness: CWE-287
Which versions are affected by CVE-2026-111958?
How do I fix CVE-2026-111958?
No fix has been published for CVE-2026-111958 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-111958 being exploited?
There is no known exploitation of CVE-2026-111958 in the wild and no public exploit code.
Sources
Also known as GHSA-5h77-wc4p-vj34.